Álgebra linear Exemplos

$[\begin{array}{c} - \frac{4}{7} & \frac{2}{7} & \frac{1}{7} & \frac{1}{7} \\ - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array}]$

Etapa 1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in row $1$ by its cofactor and add.

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Etapa 1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + & - \\ - & + & - & + \\ + & - & + & - \\ - & + & - & + \end{array} |$

Etapa 1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Etapa 1.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

$| \begin{array}{c} \frac{1}{7} & - \frac{3}{7} & \frac{1}{14} \\ - \frac{2}{7} & \frac{11}{21} & \frac{1}{42} \\ \frac{6}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 1.4

Multiply element $a_{11}$ by its cofactor.

$- \frac{4}{7} | \begin{array}{c} \frac{1}{7} & - \frac{3}{7} & \frac{1}{14} \\ - \frac{2}{7} & \frac{11}{21} & \frac{1}{42} \\ \frac{6}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 1.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

$| \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 1.6

Multiply element $a_{12}$ by its cofactor.

$- \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 1.7

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

$| \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} |$

Etapa 1.8

Multiply element $a_{13}$ by its cofactor.

$\frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} |$

Etapa 1.9

The minor for $a_{14}$ is the determinant with row $1$ and column $4$ deleted.

$| \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 1.10

Multiply element $a_{14}$ by its cofactor.

$- \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 1.11

Add the terms together.

$- \frac{4}{7} | \begin{array}{c} \frac{1}{7} & - \frac{3}{7} & \frac{1}{14} \\ - \frac{2}{7} & \frac{11}{21} & \frac{1}{42} \\ \frac{6}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2

Avalie $| \begin{array}{c} \frac{1}{7} & - \frac{3}{7} & \frac{1}{14} \\ - \frac{2}{7} & \frac{11}{21} & \frac{1}{42} \\ \frac{6}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 2.1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in row $1$ by its cofactor and add.

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Etapa 2.1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + \\ - & + & - \\ + & - & + \end{array} |$

Etapa 2.1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Etapa 2.1.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

$| \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 2.1.4

Multiply element $a_{11}$ by its cofactor.

$\frac{1}{7} | \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 2.1.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

$| \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} |$

Etapa 2.1.6

Multiply element $a_{12}$ by its cofactor.

$\frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} |$

Etapa 2.1.7

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

$| \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.1.8

Multiply element $a_{13}$ by its cofactor.

$\frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.1.9

Add the terms together.

$- \frac{4}{7} (\frac{1}{7} | \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2

Avalie $| \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 2.2.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} (\frac{1}{7} (\frac{11}{21} (- \frac{1}{14}) - (- \frac{18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2

Simplifique o determinante.

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Etapa 2.2.2.1

Simplifique cada termo.

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Etapa 2.2.2.1.1

Multiplique $\frac{11}{21} (- \frac{1}{14})$ .

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Etapa 2.2.2.1.1.1

Multiplique $\frac{11}{21}$ por $\frac{1}{14}$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{21 \cdot 14} - (- \frac{18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.1.2

Multiplique $21$ por $14$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - (- \frac{18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.2

Cancele o fator comum de $6$ .

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Etapa 2.2.2.1.2.1

Mova o negativo de maior ordem em $- \frac{18}{7}$ para o numerador.

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - (\frac{- 18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.2.2

Fatore $6$ de $- 18$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - (\frac{6 (- 3)}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.2.3

Fatore $6$ de $42$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - (\frac{6 \cdot - 3}{7} \cdot \frac{1}{6 \cdot 7})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.2.4

Cancele o fator comum.

Etapa 2.2.2.1.2.5

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - (\frac{- 3}{7} \cdot \frac{1}{7})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.3

Multiplique $\frac{- 3}{7}$ por $\frac{1}{7}$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - \frac{- 3}{7 \cdot 7}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - \frac{- 3}{49}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} - - \frac{3}{49}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.6

Multiplique $- - \frac{3}{49}$ .

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Etapa 2.2.2.1.6.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} + 1 (\frac{3}{49})) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.1.6.2

Multiplique $\frac{3}{49}$ por $1$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} + \frac{3}{49}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.2

Para escrever $\frac{3}{49}$ como fração com um denominador comum, multiplique por $\frac{6}{6}$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} + \frac{3}{49} \cdot \frac{6}{6}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.3

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 2.2.2.3.1

Multiplique $\frac{3}{49}$ por $\frac{6}{6}$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} + \frac{3 \cdot 6}{49 \cdot 6}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.3.2

Multiplique $49$ por $6$ .

$- \frac{4}{7} (\frac{1}{7} (- \frac{11}{294} + \frac{3 \cdot 6}{294}) + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.4

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{- 11 + 3 \cdot 6}{294} + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.5

Simplifique o numerador.

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Etapa 2.2.2.5.1

Multiplique $3$ por $6$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{- 11 + 18}{294} + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.5.2

Some $- 11$ e $18$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{7}{294} + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.6

Cancele o fator comum de $7$ e $294$ .

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Etapa 2.2.2.6.1

Fatore $7$ de $7$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{7 (1)}{294} + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.6.2

Cancele os fatores comuns.

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Etapa 2.2.2.6.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{7 \cdot 1}{7 \cdot 42} + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.2.2.6.2.2

Cancele o fator comum.

Etapa 2.2.2.6.2.3

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3

Avalie $| \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 2.3.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{2}{7} (- \frac{1}{14}) - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2

Simplifique o determinante.

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Etapa 2.3.2.1

Simplifique cada termo.

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Etapa 2.3.2.1.1

Cancele o fator comum de $2$ .

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Etapa 2.3.2.1.1.1

Mova o negativo de maior ordem em $- \frac{2}{7}$ para o numerador.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{- 2}{7} (- \frac{1}{14}) - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.1.2

Mova o negativo de maior ordem em $- \frac{1}{14}$ para o numerador.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{- 2}{7} \cdot \frac{- 1}{14} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.1.3

Fatore $2$ de $- 2$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{2 (- 1)}{7} \cdot \frac{- 1}{14} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.1.4

Fatore $2$ de $14$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{2 \cdot - 1}{7} \cdot \frac{- 1}{2 \cdot 7} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.1.5

Cancele o fator comum.

Etapa 2.3.2.1.1.6

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{- 1}{7} \cdot \frac{- 1}{7} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.2

Multiplique $\frac{- 1}{7}$ por $\frac{- 1}{7}$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{- - 1}{7 \cdot 7} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.3

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{7 \cdot 7} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} - \frac{6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.5

Cancele o fator comum de $6$ .

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Etapa 2.3.2.1.5.1

Mova o negativo de maior ordem em $- \frac{6}{7}$ para o numerador.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} + \frac{- 6}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.5.2

Fatore $6$ de $- 6$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} + \frac{6 (- 1)}{7} \cdot \frac{1}{42}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.5.3

Fatore $6$ de $42$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} + \frac{6 \cdot - 1}{7} \cdot \frac{1}{6 \cdot 7}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.5.4

Cancele o fator comum.

Etapa 2.3.2.1.5.5

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} + \frac{- 1}{7} \cdot \frac{1}{7}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.6

Multiplique $\frac{- 1}{7}$ por $\frac{1}{7}$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} + \frac{- 1}{7 \cdot 7}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.7

Multiplique $7$ por $7$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} + \frac{- 1}{49}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.1.8

Mova o número negativo para a frente da fração.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{1}{49} - \frac{1}{49}) + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1 - 1}{49} + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.3

Subtraia $1$ de $1$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{0}{49} + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.3.2.4

Divida $0$ por $49$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4

Avalie $| \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |$ .

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Etapa 2.4.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (- \frac{2}{7} (- \frac{18}{7}) - \frac{6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2

Simplifique o determinante.

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Etapa 2.4.2.1

Simplifique cada termo.

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Etapa 2.4.2.1.1

Multiplique $- \frac{2}{7} (- \frac{18}{7})$ .

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Etapa 2.4.2.1.1.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (1 (\frac{2}{7}) \frac{18}{7} - \frac{6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.1.2

Multiplique $\frac{2}{7}$ por $1$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{2}{7} \cdot \frac{18}{7} - \frac{6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.1.3

Multiplique $\frac{2}{7}$ por $\frac{18}{7}$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{2 \cdot 18}{7 \cdot 7} - \frac{6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.1.4

Multiplique $2$ por $18$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{7 \cdot 7} - \frac{6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.1.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} - \frac{6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.2

Cancele o fator comum de $3$ .

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Etapa 2.4.2.1.2.1

Mova o negativo de maior ordem em $- \frac{6}{7}$ para o numerador.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{- 6}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.2.2

Fatore $3$ de $- 6$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{3 (- 2)}{7} \cdot \frac{11}{21})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.2.3

Fatore $3$ de $21$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{3 \cdot - 2}{7} \cdot \frac{11}{3 \cdot 7})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.2.4

Cancele o fator comum.

Etapa 2.4.2.1.2.5

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{- 2}{7} \cdot \frac{11}{7})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.3

Multiplique $\frac{- 2}{7}$ por $\frac{11}{7}$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{- 2 \cdot 11}{7 \cdot 7})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.4

Multiplique $- 2$ por $11$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{- 22}{7 \cdot 7})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} + \frac{- 22}{49})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.1.6

Mova o número negativo para a frente da fração.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} (\frac{36}{49} - \frac{22}{49})) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{36 - 22}{49}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.3

Subtraia $22$ de $36$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{14}{49}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.4

Cancele o fator comum de $14$ e $49$ .

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Etapa 2.4.2.4.1

Fatore $7$ de $14$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{7 (2)}{49}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.4.2

Cancele os fatores comuns.

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Etapa 2.4.2.4.2.1

Fatore $7$ de $49$ .

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{7 \cdot 2}{7 \cdot 7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.4.2.4.2.2

Cancele o fator comum.

Etapa 2.4.2.4.2.3

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{2}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5

Simplifique o determinante.

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Etapa 2.5.1

Simplifique cada termo.

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Etapa 2.5.1.1

Multiplique $\frac{1}{7} \cdot \frac{1}{42}$ .

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Etapa 2.5.1.1.1

Multiplique $\frac{1}{7}$ por $\frac{1}{42}$ .

$- \frac{4}{7} (\frac{1}{7 \cdot 42} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{2}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.1.2

Multiplique $7$ por $42$ .

$- \frac{4}{7} (\frac{1}{294} + \frac{3}{7} \cdot 0 + \frac{1}{14} \cdot \frac{2}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.2

Multiplique $\frac{3}{7}$ por $0$ .

$- \frac{4}{7} (\frac{1}{294} + 0 + \frac{1}{14} \cdot \frac{2}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.3

Cancele o fator comum de $2$ .

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Etapa 2.5.1.3.1

Fatore $2$ de $14$ .

$- \frac{4}{7} (\frac{1}{294} + 0 + \frac{1}{2 (7)} \cdot \frac{2}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.3.2

Cancele o fator comum.

$- \frac{4}{7} (\frac{1}{294} + 0 + \frac{1}{2 \cdot 7} \cdot \frac{2}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.3.3

Reescreva a expressão.

$- \frac{4}{7} (\frac{1}{294} + 0 + \frac{1}{7} \cdot \frac{1}{7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.4

Multiplique $\frac{1}{7}$ por $\frac{1}{7}$ .

$- \frac{4}{7} (\frac{1}{294} + 0 + \frac{1}{7 \cdot 7}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.1.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} (\frac{1}{294} + 0 + \frac{1}{49}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.2

Some $\frac{1}{294}$ e $0$ .

$- \frac{4}{7} (\frac{1}{294} + \frac{1}{49}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.3

Para escrever $\frac{1}{49}$ como fração com um denominador comum, multiplique por $\frac{6}{6}$ .

$- \frac{4}{7} (\frac{1}{294} + \frac{1}{49} \cdot \frac{6}{6}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.4

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 2.5.4.1

Multiplique $\frac{1}{49}$ por $\frac{6}{6}$ .

$- \frac{4}{7} (\frac{1}{294} + \frac{6}{49 \cdot 6}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.4.2

Multiplique $49$ por $6$ .

$- \frac{4}{7} (\frac{1}{294} + \frac{6}{294}) - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.5

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1 + 6}{294} - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.6

Some $1$ e $6$ .

$- \frac{4}{7} \cdot \frac{7}{294} - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.7

Cancele o fator comum de $7$ e $294$ .

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Etapa 2.5.7.1

Fatore $7$ de $7$ .

$- \frac{4}{7} \cdot \frac{7 (1)}{294} - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.7.2

Cancele os fatores comuns.

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Etapa 2.5.7.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} \cdot \frac{7 \cdot 1}{7 \cdot 42} - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 2.5.7.2.2

Cancele o fator comum.

Etapa 2.5.7.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} | \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3

Avalie $| \begin{array}{c} - \frac{9}{7} & - \frac{3}{7} & \frac{1}{14} \\ \frac{40}{21} & \frac{11}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{18}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 3.1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in row $1$ by its cofactor and add.

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Etapa 3.1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + \\ - & + & - \\ + & - & + \end{array} |$

Etapa 3.1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Etapa 3.1.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

$| \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 3.1.4

Multiply element $a_{11}$ by its cofactor.

$- \frac{9}{7} | \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} |$

Etapa 3.1.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

$| \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} |$

Etapa 3.1.6

Multiply element $a_{12}$ by its cofactor.

$\frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} |$

Etapa 3.1.7

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

$| \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.1.8

Multiply element $a_{13}$ by its cofactor.

$\frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.1.9

Add the terms together.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} | \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} | + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2

Avalie $| \begin{array}{c} \frac{11}{21} & \frac{1}{42} \\ - \frac{18}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 3.2.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (\frac{11}{21} (- \frac{1}{14}) - (- \frac{18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2

Simplifique o determinante.

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Etapa 3.2.2.1

Simplifique cada termo.

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Etapa 3.2.2.1.1

Multiplique $\frac{11}{21} (- \frac{1}{14})$ .

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Etapa 3.2.2.1.1.1

Multiplique $\frac{11}{21}$ por $\frac{1}{14}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{21 \cdot 14} - (- \frac{18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.1.2

Multiplique $21$ por $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - (- \frac{18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.2

Cancele o fator comum de $6$ .

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Etapa 3.2.2.1.2.1

Mova o negativo de maior ordem em $- \frac{18}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - (\frac{- 18}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.2.2

Fatore $6$ de $- 18$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - (\frac{6 (- 3)}{7} \cdot \frac{1}{42})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.2.3

Fatore $6$ de $42$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - (\frac{6 \cdot - 3}{7} \cdot \frac{1}{6 \cdot 7})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.2.4

Cancele o fator comum.

Etapa 3.2.2.1.2.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - (\frac{- 3}{7} \cdot \frac{1}{7})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.3

Multiplique $\frac{- 3}{7}$ por $\frac{1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - \frac{- 3}{7 \cdot 7}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - \frac{- 3}{49}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} - - \frac{3}{49}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.6

Multiplique $- - \frac{3}{49}$ .

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Etapa 3.2.2.1.6.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} + 1 (\frac{3}{49})) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.1.6.2

Multiplique $\frac{3}{49}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} + \frac{3}{49}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.2

Para escrever $\frac{3}{49}$ como fração com um denominador comum, multiplique por $\frac{6}{6}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} + \frac{3}{49} \cdot \frac{6}{6}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.3

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 3.2.2.3.1

Multiplique $\frac{3}{49}$ por $\frac{6}{6}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} + \frac{3 \cdot 6}{49 \cdot 6}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.3.2

Multiplique $49$ por $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} (- \frac{11}{294} + \frac{3 \cdot 6}{294}) + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.4

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{- 11 + 3 \cdot 6}{294} + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.5

Simplifique o numerador.

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Etapa 3.2.2.5.1

Multiplique $3$ por $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{- 11 + 18}{294} + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.5.2

Some $- 11$ e $18$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{7}{294} + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.6

Cancele o fator comum de $7$ e $294$ .

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Etapa 3.2.2.6.1

Fatore $7$ de $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{7 (1)}{294} + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.6.2

Cancele os fatores comuns.

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Etapa 3.2.2.6.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{7 \cdot 1}{7 \cdot 42} + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.2.2.6.2.2

Cancele o fator comum.

Etapa 3.2.2.6.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3

Avalie $| \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 3.3.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{40}{21} (- \frac{1}{14}) - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2

Simplifique o determinante.

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Etapa 3.3.2.1

Simplifique cada termo.

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Etapa 3.3.2.1.1

Cancele o fator comum de $2$ .

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Etapa 3.3.2.1.1.1

Mova o negativo de maior ordem em $- \frac{1}{14}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{40}{21} \cdot \frac{- 1}{14} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.1.2

Fatore $2$ de $40$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{2 (20)}{21} \cdot \frac{- 1}{14} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.1.3

Fatore $2$ de $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{2 \cdot 20}{21} \cdot \frac{- 1}{2 \cdot 7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.1.4

Cancele o fator comum.

Etapa 3.3.2.1.1.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{20}{21} \cdot \frac{- 1}{7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.2

Multiplique $\frac{20}{21}$ por $\frac{- 1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{20 \cdot - 1}{21 \cdot 7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.3

Multiplique $20$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{- 20}{21 \cdot 7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.4

Multiplique $21$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (\frac{- 20}{147} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20}{147} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.6

Multiplique $- \frac{47}{7} \cdot \frac{1}{42}$ .

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Etapa 3.3.2.1.6.1

Multiplique $\frac{1}{42}$ por $\frac{47}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20}{147} - - \frac{47}{42 \cdot 7}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.6.2

Multiplique $42$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20}{147} - - \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.7

Multiplique $- - \frac{47}{294}$ .

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Etapa 3.3.2.1.7.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20}{147} + 1 (\frac{47}{294})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.1.7.2

Multiplique $\frac{47}{294}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20}{147} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.2

Para escrever $- \frac{20}{147}$ como fração com um denominador comum, multiplique por $\frac{2}{2}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20}{147} \cdot \frac{2}{2} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.3

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 3.3.2.3.1

Multiplique $\frac{20}{147}$ por $\frac{2}{2}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20 \cdot 2}{147 \cdot 2} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.3.2

Multiplique $147$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} (- \frac{20 \cdot 2}{294} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.4

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{- 20 \cdot 2 + 47}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.5

Simplifique o numerador.

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Etapa 3.3.2.5.1

Multiplique $- 20$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{- 40 + 47}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.5.2

Some $- 40$ e $47$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{7}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.6

Cancele o fator comum de $7$ e $294$ .

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Etapa 3.3.2.6.1

Fatore $7$ de $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{7 (1)}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.6.2

Cancele os fatores comuns.

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Etapa 3.3.2.6.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{7 \cdot 1}{7 \cdot 42} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.3.2.6.2.2

Cancele o fator comum.

Etapa 3.3.2.6.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4

Avalie $| \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |$ .

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Etapa 3.4.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{21} (- \frac{18}{7}) - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2

Simplifique o determinante.

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Etapa 3.4.2.1

Simplifique cada termo.

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Etapa 3.4.2.1.1

Cancele o fator comum de $3$ .

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Etapa 3.4.2.1.1.1

Mova o negativo de maior ordem em $- \frac{18}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{21} \cdot \frac{- 18}{7} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.1.2

Fatore $3$ de $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{3 (7)} \cdot \frac{- 18}{7} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.1.3

Fatore $3$ de $- 18$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{3 \cdot 7} \cdot \frac{3 \cdot - 6}{7} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.1.4

Cancele o fator comum.

Etapa 3.4.2.1.1.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{7} \cdot \frac{- 6}{7} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.2

Multiplique $\frac{40}{7}$ por $\frac{- 6}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40 \cdot - 6}{7 \cdot 7} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.3

Multiplique $40$ por $- 6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{- 240}{7 \cdot 7} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{- 240}{49} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} - (- \frac{47}{7} \cdot \frac{11}{21}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.6

Multiplique $- \frac{47}{7} \cdot \frac{11}{21}$ .

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Etapa 3.4.2.1.6.1

Multiplique $\frac{11}{21}$ por $\frac{47}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} - - \frac{11 \cdot 47}{21 \cdot 7})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.6.2

Multiplique $11$ por $47$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} - - \frac{517}{21 \cdot 7})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.6.3

Multiplique $21$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} - - \frac{517}{147})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.7

Multiplique $- - \frac{517}{147}$ .

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Etapa 3.4.2.1.7.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} + 1 (\frac{517}{147}))) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.1.7.2

Multiplique $\frac{517}{147}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} + \frac{517}{147})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.2

Para escrever $- \frac{240}{49}$ como fração com um denominador comum, multiplique por $\frac{3}{3}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240}{49} \cdot \frac{3}{3} + \frac{517}{147})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.3

Escreva cada expressão com um denominador comum de $147$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 3.4.2.3.1

Multiplique $\frac{240}{49}$ por $\frac{3}{3}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240 \cdot 3}{49 \cdot 3} + \frac{517}{147})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.3.2

Multiplique $49$ por $3$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{240 \cdot 3}{147} + \frac{517}{147})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.4

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{- 240 \cdot 3 + 517}{147}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.5

Simplifique o numerador.

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Etapa 3.4.2.5.1

Multiplique $- 240$ por $3$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{- 720 + 517}{147}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.5.2

Some $- 720$ e $517$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{- 203}{147}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.6

Cancele o fator comum de $- 203$ e $147$ .

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Etapa 3.4.2.6.1

Fatore $7$ de $- 203$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{7 (- 29)}{147}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.6.2

Cancele os fatores comuns.

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Etapa 3.4.2.6.2.1

Fatore $7$ de $147$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{7 \cdot - 29}{7 \cdot 21}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.6.2.2

Cancele o fator comum.

Etapa 3.4.2.6.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{- 29}{21}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.4.2.7

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5

Simplifique o determinante.

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Etapa 3.5.1

Simplifique cada termo.

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Etapa 3.5.1.1

Cancele o fator comum de $3$ .

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Etapa 3.5.1.1.1

Mova o negativo de maior ordem em $- \frac{9}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 9}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.1.2

Fatore $3$ de $- 9$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{3 (- 3)}{7} \cdot \frac{1}{42} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.1.3

Fatore $3$ de $42$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{3 \cdot - 3}{7} \cdot \frac{1}{3 \cdot 14} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.1.4

Cancele o fator comum.

Etapa 3.5.1.1.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 3}{7} \cdot \frac{1}{14} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.2

Multiplique $\frac{- 3}{7}$ por $\frac{1}{14}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 3}{7 \cdot 14} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.3

Multiplique $7$ por $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 3}{98} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.4

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{3}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.5

Cancele o fator comum de $3$ .

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Etapa 3.5.1.5.1

Fatore $3$ de $42$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{3}{7} \cdot \frac{1}{3 (14)} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.5.2

Cancele o fator comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{3}{7} \cdot \frac{1}{3 \cdot 14} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.5.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{1}{7} \cdot \frac{1}{14} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.6

Multiplique $\frac{1}{7}$ por $\frac{1}{14}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{1}{7 \cdot 14} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.7

Multiplique $7$ por $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{1}{98} + \frac{1}{14} (- \frac{29}{21})) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.8

Multiplique $\frac{1}{14} (- \frac{29}{21})$ .

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Etapa 3.5.1.8.1

Multiplique $\frac{1}{14}$ por $\frac{29}{21}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{1}{98} - \frac{29}{14 \cdot 21}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.1.8.2

Multiplique $14$ por $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{3}{98} + \frac{1}{98} - \frac{29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 3 + 1}{98} + \frac{- 29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.3

Some $- 3$ e $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 2}{98} + \frac{- 29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.4

Simplifique cada termo.

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Etapa 3.5.4.1

Cancele o fator comum de $- 2$ e $98$ .

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Etapa 3.5.4.1.1

Fatore $2$ de $- 2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{2 (- 1)}{98} + \frac{- 29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.4.1.2

Cancele os fatores comuns.

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Etapa 3.5.4.1.2.1

Fatore $2$ de $98$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{2 \cdot - 1}{2 \cdot 49} + \frac{- 29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.4.1.2.2

Cancele o fator comum.

Etapa 3.5.4.1.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (\frac{- 1}{49} + \frac{- 29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.4.2

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{1}{49} + \frac{- 29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.4.3

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{1}{49} - \frac{29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.5

Para escrever $- \frac{1}{49}$ como fração com um denominador comum, multiplique por $\frac{6}{6}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{1}{49} \cdot \frac{6}{6} - \frac{29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.6

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 3.5.6.1

Multiplique $\frac{1}{49}$ por $\frac{6}{6}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{6}{49 \cdot 6} - \frac{29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.6.2

Multiplique $49$ por $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{6}{294} - \frac{29}{294}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.7

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} \cdot \frac{- 6 - 29}{294} + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.8

Subtraia $29$ de $- 6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} \cdot \frac{- 35}{294} + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.9

Cancele o fator comum de $- 35$ e $294$ .

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Etapa 3.5.9.1

Fatore $7$ de $- 35$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} \cdot \frac{7 (- 5)}{294} + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.9.2

Cancele os fatores comuns.

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Etapa 3.5.9.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} \cdot \frac{7 \cdot - 5}{7 \cdot 42} + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.9.2.2

Cancele o fator comum.

Etapa 3.5.9.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} \cdot \frac{- 5}{42} + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 3.5.10

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4

Avalie $| \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & \frac{1}{14} \\ \frac{40}{21} & - \frac{2}{7} & \frac{1}{42} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 4.1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in row $1$ by its cofactor and add.

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Etapa 4.1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + \\ - & + & - \\ + & - & + \end{array} |$

Etapa 4.1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Etapa 4.1.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

$| \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} |$

Etapa 4.1.4

Multiply element $a_{11}$ by its cofactor.

$- \frac{9}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} |$

Etapa 4.1.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

$| \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} |$

Etapa 4.1.6

Multiply element $a_{12}$ by its cofactor.

$- \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} |$

Etapa 4.1.7

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

$| \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |$

Etapa 4.1.8

Multiply element $a_{13}$ by its cofactor.

$\frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |$

Etapa 4.1.9

Add the terms together.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} | \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} | - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2

Avalie $| \begin{array}{c} - \frac{2}{7} & \frac{1}{42} \\ \frac{6}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 4.2.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (- \frac{2}{7} (- \frac{1}{14}) - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2

Simplifique o determinante.

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Etapa 4.2.2.1

Simplifique cada termo.

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Etapa 4.2.2.1.1

Cancele o fator comum de $2$ .

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Etapa 4.2.2.1.1.1

Mova o negativo de maior ordem em $- \frac{2}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{- 2}{7} (- \frac{1}{14}) - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.1.2

Mova o negativo de maior ordem em $- \frac{1}{14}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{- 2}{7} \cdot \frac{- 1}{14} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.1.3

Fatore $2$ de $- 2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{2 (- 1)}{7} \cdot \frac{- 1}{14} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.1.4

Fatore $2$ de $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{2 \cdot - 1}{7} \cdot \frac{- 1}{2 \cdot 7} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.1.5

Cancele o fator comum.

Etapa 4.2.2.1.1.6

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{- 1}{7} \cdot \frac{- 1}{7} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.2

Multiplique $\frac{- 1}{7}$ por $\frac{- 1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{- - 1}{7 \cdot 7} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.3

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{7 \cdot 7} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} - \frac{6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.5

Cancele o fator comum de $6$ .

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Etapa 4.2.2.1.5.1

Mova o negativo de maior ordem em $- \frac{6}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} + \frac{- 6}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.5.2

Fatore $6$ de $- 6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} + \frac{6 (- 1)}{7} \cdot \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.5.3

Fatore $6$ de $42$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} + \frac{6 \cdot - 1}{7} \cdot \frac{1}{6 \cdot 7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.5.4

Cancele o fator comum.

Etapa 4.2.2.1.5.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} + \frac{- 1}{7} \cdot \frac{1}{7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.6

Multiplique $\frac{- 1}{7}$ por $\frac{1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} + \frac{- 1}{7 \cdot 7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.7

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} + \frac{- 1}{49}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.1.8

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} (\frac{1}{49} - \frac{1}{49}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot \frac{1 - 1}{49} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.3

Subtraia $1$ de $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot \frac{0}{49} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.2.2.4

Divida $0$ por $49$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} | + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3

Avalie $| \begin{array}{c} \frac{40}{21} & \frac{1}{42} \\ - \frac{47}{7} & - \frac{1}{14} \end{array} |$ .

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Etapa 4.3.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{40}{21} (- \frac{1}{14}) - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2

Simplifique o determinante.

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Etapa 4.3.2.1

Simplifique cada termo.

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Etapa 4.3.2.1.1

Cancele o fator comum de $2$ .

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Etapa 4.3.2.1.1.1

Mova o negativo de maior ordem em $- \frac{1}{14}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{40}{21} \cdot \frac{- 1}{14} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.1.2

Fatore $2$ de $40$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{2 (20)}{21} \cdot \frac{- 1}{14} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.1.3

Fatore $2$ de $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{2 \cdot 20}{21} \cdot \frac{- 1}{2 \cdot 7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.1.4

Cancele o fator comum.

Etapa 4.3.2.1.1.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{20}{21} \cdot \frac{- 1}{7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.2

Multiplique $\frac{20}{21}$ por $\frac{- 1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{20 \cdot - 1}{21 \cdot 7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.3

Multiplique $20$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{- 20}{21 \cdot 7} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.4

Multiplique $21$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (\frac{- 20}{147} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20}{147} - (- \frac{47}{7} \cdot \frac{1}{42})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.6

Multiplique $- \frac{47}{7} \cdot \frac{1}{42}$ .

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Etapa 4.3.2.1.6.1

Multiplique $\frac{1}{42}$ por $\frac{47}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20}{147} - - \frac{47}{42 \cdot 7}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.6.2

Multiplique $42$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20}{147} - - \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.7

Multiplique $- - \frac{47}{294}$ .

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Etapa 4.3.2.1.7.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20}{147} + 1 (\frac{47}{294})) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.1.7.2

Multiplique $\frac{47}{294}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20}{147} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.2

Para escrever $- \frac{20}{147}$ como fração com um denominador comum, multiplique por $\frac{2}{2}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20}{147} \cdot \frac{2}{2} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.3

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 4.3.2.3.1

Multiplique $\frac{20}{147}$ por $\frac{2}{2}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20 \cdot 2}{147 \cdot 2} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.3.2

Multiplique $147$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} (- \frac{20 \cdot 2}{294} + \frac{47}{294}) + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.4

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{- 20 \cdot 2 + 47}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.5

Simplifique o numerador.

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Etapa 4.3.2.5.1

Multiplique $- 20$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{- 40 + 47}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.5.2

Some $- 40$ e $47$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{7}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.6

Cancele o fator comum de $7$ e $294$ .

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Etapa 4.3.2.6.1

Fatore $7$ de $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{7 (1)}{294} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.6.2

Cancele os fatores comuns.

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Etapa 4.3.2.6.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{7 \cdot 1}{7 \cdot 42} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.3.2.6.2.2

Cancele o fator comum.

Etapa 4.3.2.6.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4

Avalie $| \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |$ .

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Etapa 4.4.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{21} \cdot \frac{6}{7} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2

Simplifique o determinante.

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Etapa 4.4.2.1

Simplifique cada termo.

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Etapa 4.4.2.1.1

Cancele o fator comum de $3$ .

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Etapa 4.4.2.1.1.1

Fatore $3$ de $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{3 (7)} \cdot \frac{6}{7} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.1.2

Fatore $3$ de $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{3 \cdot 7} \cdot \frac{3 \cdot 2}{7} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.1.3

Cancele o fator comum.

Etapa 4.4.2.1.1.4

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40}{7} \cdot \frac{2}{7} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.2

Multiplique $\frac{40}{7}$ por $\frac{2}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{40 \cdot 2}{7 \cdot 7} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.3

Multiplique $40$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{7 \cdot 7} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{49} - (- \frac{47}{7} (- \frac{2}{7})))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.5

Multiplique $- \frac{47}{7} (- \frac{2}{7})$ .

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Etapa 4.4.2.1.5.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{49} - (1 (\frac{47}{7}) \frac{2}{7}))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.5.2

Multiplique $\frac{47}{7}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{49} - (\frac{47}{7} \cdot \frac{2}{7}))) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.5.3

Multiplique $\frac{47}{7}$ por $\frac{2}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{49} - \frac{47 \cdot 2}{7 \cdot 7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.5.4

Multiplique $47$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{49} - \frac{94}{7 \cdot 7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.1.5.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (\frac{80}{49} - \frac{94}{49})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{80 - 94}{49}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.3

Subtraia $94$ de $80$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{- 14}{49}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.4

Cancele o fator comum de $- 14$ e $49$ .

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Etapa 4.4.2.4.1

Fatore $7$ de $- 14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{7 (- 2)}{49}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.4.2

Cancele os fatores comuns.

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Etapa 4.4.2.4.2.1

Fatore $7$ de $49$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{7 \cdot - 2}{7 \cdot 7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.4.2.2

Cancele o fator comum.

Etapa 4.4.2.4.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} \cdot \frac{- 2}{7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.4.2.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{9}{7} \cdot 0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{2}{7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5

Simplifique o determinante.

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Etapa 4.5.1

Simplifique cada termo.

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Etapa 4.5.1.1

Multiplique $- \frac{9}{7} \cdot 0$ .

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Etapa 4.5.1.1.1

Multiplique $0$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 (\frac{9}{7}) - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{2}{7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.1.2

Multiplique $0$ por $\frac{9}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{7} \cdot \frac{1}{42} + \frac{1}{14} (- \frac{2}{7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.2

Multiplique $- \frac{1}{7} \cdot \frac{1}{42}$ .

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Etapa 4.5.1.2.1

Multiplique $\frac{1}{42}$ por $\frac{1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{42 \cdot 7} + \frac{1}{14} (- \frac{2}{7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.2.2

Multiplique $42$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{1}{14} (- \frac{2}{7})) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.3

Cancele o fator comum de $2$ .

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Etapa 4.5.1.3.1

Mova o negativo de maior ordem em $- \frac{2}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{1}{14} \cdot \frac{- 2}{7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.3.2

Fatore $2$ de $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{1}{2 (7)} \cdot \frac{- 2}{7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.3.3

Fatore $2$ de $- 2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{1}{2 \cdot 7} \cdot \frac{2 \cdot - 1}{7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.3.4

Cancele o fator comum.

Etapa 4.5.1.3.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{1}{7} \cdot \frac{- 1}{7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.4

Multiplique $\frac{1}{7}$ por $\frac{- 1}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{- 1}{7 \cdot 7}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} + \frac{- 1}{49}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.1.6

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (0 - \frac{1}{294} - \frac{1}{49}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.2

Subtraia $\frac{1}{294}$ de $0$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{294} - \frac{1}{49}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.3

Para escrever $- \frac{1}{49}$ como fração com um denominador comum, multiplique por $\frac{6}{6}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{294} - \frac{1}{49} \cdot \frac{6}{6}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.4

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 4.5.4.1

Multiplique $\frac{1}{49}$ por $\frac{6}{6}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{294} - \frac{6}{49 \cdot 6}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.4.2

Multiplique $49$ por $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{294} - \frac{6}{294}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.5

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} \cdot \frac{- 1 - 6}{294} - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.6

Subtraia $6$ de $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} \cdot \frac{- 7}{294} - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.7

Cancele o fator comum de $- 7$ e $294$ .

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Etapa 4.5.7.1

Fatore $7$ de $- 7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} \cdot \frac{7 (- 1)}{294} - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.7.2

Cancele os fatores comuns.

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Etapa 4.5.7.2.1

Fatore $7$ de $294$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} \cdot \frac{7 \cdot - 1}{7 \cdot 42} - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.7.2.2

Cancele o fator comum.

Etapa 4.5.7.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} \cdot \frac{- 1}{42} - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 4.5.8

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} | \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 5

Avalie $| \begin{array}{c} - \frac{9}{7} & \frac{1}{7} & - \frac{3}{7} \\ \frac{40}{21} & - \frac{2}{7} & \frac{11}{21} \\ - \frac{47}{7} & \frac{6}{7} & - \frac{18}{7} \end{array} |$ .

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Etapa 5.1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in row $1$ by its cofactor and add.

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Etapa 5.1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + \\ - & + & - \\ + & - & + \end{array} |$

Etapa 5.1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Etapa 5.1.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

$| \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 5.1.4

Multiply element $a_{11}$ by its cofactor.

$- \frac{9}{7} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |$

Etapa 5.1.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

$| \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |$

Etapa 5.1.6

Multiply element $a_{12}$ by its cofactor.

$- \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |$

Etapa 5.1.7

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

$| \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |$

Etapa 5.1.8

Multiply element $a_{13}$ by its cofactor.

$- \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |$

Etapa 5.1.9

Add the terms together.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} | \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} | - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2

Avalie $| \begin{array}{c} - \frac{2}{7} & \frac{11}{21} \\ \frac{6}{7} & - \frac{18}{7} \end{array} |$ .

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Etapa 5.2.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (- \frac{2}{7} (- \frac{18}{7}) - \frac{6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2

Simplifique o determinante.

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Etapa 5.2.2.1

Simplifique cada termo.

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Etapa 5.2.2.1.1

Multiplique $- \frac{2}{7} (- \frac{18}{7})$ .

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Etapa 5.2.2.1.1.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (1 (\frac{2}{7}) \frac{18}{7} - \frac{6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.1.2

Multiplique $\frac{2}{7}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{2}{7} \cdot \frac{18}{7} - \frac{6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.1.3

Multiplique $\frac{2}{7}$ por $\frac{18}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{2 \cdot 18}{7 \cdot 7} - \frac{6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.1.4

Multiplique $2$ por $18$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{7 \cdot 7} - \frac{6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.1.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} - \frac{6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.2

Cancele o fator comum de $3$ .

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Etapa 5.2.2.1.2.1

Mova o negativo de maior ordem em $- \frac{6}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{- 6}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.2.2

Fatore $3$ de $- 6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{3 (- 2)}{7} \cdot \frac{11}{21}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.2.3

Fatore $3$ de $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{3 \cdot - 2}{7} \cdot \frac{11}{3 \cdot 7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.2.4

Cancele o fator comum.

Etapa 5.2.2.1.2.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{- 2}{7} \cdot \frac{11}{7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.3

Multiplique $\frac{- 2}{7}$ por $\frac{11}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{- 2 \cdot 11}{7 \cdot 7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.4

Multiplique $- 2$ por $11$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{- 22}{7 \cdot 7}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} + \frac{- 22}{49}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.1.6

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} (\frac{36}{49} - \frac{22}{49}) - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{36 - 22}{49} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.3

Subtraia $22$ de $36$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{14}{49} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.4

Cancele o fator comum de $14$ e $49$ .

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Etapa 5.2.2.4.1

Fatore $7$ de $14$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{7 (2)}{49} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.4.2

Cancele os fatores comuns.

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Etapa 5.2.2.4.2.1

Fatore $7$ de $49$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{7 \cdot 2}{7 \cdot 7} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.2.2.4.2.2

Cancele o fator comum.

Etapa 5.2.2.4.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} | \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} | - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3

Avalie $| \begin{array}{c} \frac{40}{21} & \frac{11}{21} \\ - \frac{47}{7} & - \frac{18}{7} \end{array} |$ .

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Etapa 5.3.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{40}{21} (- \frac{18}{7}) - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2

Simplifique o determinante.

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Etapa 5.3.2.1

Simplifique cada termo.

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Etapa 5.3.2.1.1

Cancele o fator comum de $3$ .

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Etapa 5.3.2.1.1.1

Mova o negativo de maior ordem em $- \frac{18}{7}$ para o numerador.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{40}{21} \cdot \frac{- 18}{7} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.1.2

Fatore $3$ de $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{40}{3 (7)} \cdot \frac{- 18}{7} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.1.3

Fatore $3$ de $- 18$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{40}{3 \cdot 7} \cdot \frac{3 \cdot - 6}{7} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.1.4

Cancele o fator comum.

Etapa 5.3.2.1.1.5

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{40}{7} \cdot \frac{- 6}{7} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.2

Multiplique $\frac{40}{7}$ por $\frac{- 6}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{40 \cdot - 6}{7 \cdot 7} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.3

Multiplique $40$ por $- 6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{- 240}{7 \cdot 7} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (\frac{- 240}{49} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.5

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} - (- \frac{47}{7} \cdot \frac{11}{21})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.6

Multiplique $- \frac{47}{7} \cdot \frac{11}{21}$ .

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Etapa 5.3.2.1.6.1

Multiplique $\frac{11}{21}$ por $\frac{47}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} - - \frac{11 \cdot 47}{21 \cdot 7}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.6.2

Multiplique $11$ por $47$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} - - \frac{517}{21 \cdot 7}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.6.3

Multiplique $21$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} - - \frac{517}{147}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.7

Multiplique $- - \frac{517}{147}$ .

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Etapa 5.3.2.1.7.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} + 1 (\frac{517}{147})) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.1.7.2

Multiplique $\frac{517}{147}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} + \frac{517}{147}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.2

Para escrever $- \frac{240}{49}$ como fração com um denominador comum, multiplique por $\frac{3}{3}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240}{49} \cdot \frac{3}{3} + \frac{517}{147}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.3

Escreva cada expressão com um denominador comum de $147$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 5.3.2.3.1

Multiplique $\frac{240}{49}$ por $\frac{3}{3}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240 \cdot 3}{49 \cdot 3} + \frac{517}{147}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.3.2

Multiplique $49$ por $3$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{240 \cdot 3}{147} + \frac{517}{147}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.4

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} \cdot \frac{- 240 \cdot 3 + 517}{147} - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.5

Simplifique o numerador.

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Etapa 5.3.2.5.1

Multiplique $- 240$ por $3$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} \cdot \frac{- 720 + 517}{147} - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.5.2

Some $- 720$ e $517$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} \cdot \frac{- 203}{147} - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.6

Cancele o fator comum de $- 203$ e $147$ .

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Etapa 5.3.2.6.1

Fatore $7$ de $- 203$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} \cdot \frac{7 (- 29)}{147} - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.6.2

Cancele os fatores comuns.

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Etapa 5.3.2.6.2.1

Fatore $7$ de $147$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} \cdot \frac{7 \cdot - 29}{7 \cdot 21} - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.6.2.2

Cancele o fator comum.

Etapa 5.3.2.6.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} \cdot \frac{- 29}{21} - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.3.2.7

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} | \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |)$

Etapa 5.4

Avalie $| \begin{array}{c} \frac{40}{21} & - \frac{2}{7} \\ - \frac{47}{7} & \frac{6}{7} \end{array} |$ .

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Etapa 5.4.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{40}{21} \cdot \frac{6}{7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2

Simplifique o determinante.

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Etapa 5.4.2.1

Simplifique cada termo.

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Etapa 5.4.2.1.1

Cancele o fator comum de $3$ .

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Etapa 5.4.2.1.1.1

Fatore $3$ de $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{40}{3 (7)} \cdot \frac{6}{7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.1.2

Fatore $3$ de $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{40}{3 \cdot 7} \cdot \frac{3 \cdot 2}{7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.1.3

Cancele o fator comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{40}{3 \cdot 7} \cdot \frac{3 \cdot 2}{7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.1.4

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{40}{7} \cdot \frac{2}{7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.2

Multiplique $\frac{40}{7}$ por $\frac{2}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{40 \cdot 2}{7 \cdot 7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.3

Multiplique $40$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{80}{7 \cdot 7} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.4

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{80}{49} - (- \frac{47}{7} (- \frac{2}{7}))))$

Etapa 5.4.2.1.5

Multiplique $- \frac{47}{7} (- \frac{2}{7})$ .

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Etapa 5.4.2.1.5.1

Multiplique $- 1$ por $- 1$ .

Etapa 5.4.2.1.5.2

Multiplique $\frac{47}{7}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{9}{7} \cdot \frac{2}{7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (\frac{80}{49} - (\frac{47}{7} \cdot \frac{2}{7})))$

Etapa 5.4.2.1.5.3

Multiplique $\frac{47}{7}$ por $\frac{2}{7}$ .

Etapa 5.4.2.1.5.4

Multiplique $47$ por $2$ .

Etapa 5.4.2.1.5.5

Multiplique $7$ por $7$ .

Etapa 5.4.2.2

Combine os numeradores em relação ao denominador comum.

Etapa 5.4.2.3

Subtraia $94$ de $80$ .

Etapa 5.4.2.4

Cancele o fator comum de $- 14$ e $49$ .

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Etapa 5.4.2.4.1

Fatore $7$ de $- 14$ .

Etapa 5.4.2.4.2

Cancele os fatores comuns.

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Etapa 5.4.2.4.2.1

Fatore $7$ de $49$ .

Etapa 5.4.2.4.2.2

Cancele o fator comum.

Etapa 5.4.2.4.2.3

Reescreva a expressão.

Etapa 5.4.2.5

Mova o número negativo para a frente da fração.

Etapa 5.5

Simplifique o determinante.

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Etapa 5.5.1

Simplifique cada termo.

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Etapa 5.5.1.1

Multiplique $- \frac{9}{7} \cdot \frac{2}{7}$ .

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Etapa 5.5.1.1.1

Multiplique $\frac{2}{7}$ por $\frac{9}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{2 \cdot 9}{7 \cdot 7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.1.2

Multiplique $2$ por $9$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{7 \cdot 7} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.1.3

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} - \frac{1}{7} (- \frac{29}{21}) - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.2

Multiplique $- \frac{1}{7} (- \frac{29}{21})$ .

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Etapa 5.5.1.2.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + 1 (\frac{1}{7}) \frac{29}{21} - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.2.2

Multiplique $\frac{1}{7}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{1}{7} \cdot \frac{29}{21} - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.2.3

Multiplique $\frac{1}{7}$ por $\frac{29}{21}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{7 \cdot 21} - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.2.4

Multiplique $7$ por $21$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{147} - \frac{3}{7} (- \frac{2}{7}))$

Etapa 5.5.1.3

Multiplique $- \frac{3}{7} (- \frac{2}{7})$ .

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Etapa 5.5.1.3.1

Multiplique $- 1$ por $- 1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{147} + 1 (\frac{3}{7}) \frac{2}{7})$

Etapa 5.5.1.3.2

Multiplique $\frac{3}{7}$ por $1$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{147} + \frac{3}{7} \cdot \frac{2}{7})$

Etapa 5.5.1.3.3

Multiplique $\frac{3}{7}$ por $\frac{2}{7}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{147} + \frac{3 \cdot 2}{7 \cdot 7})$

Etapa 5.5.1.3.4

Multiplique $3$ por $2$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{147} + \frac{6}{7 \cdot 7})$

Etapa 5.5.1.3.5

Multiplique $7$ por $7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{18}{49} + \frac{29}{147} + \frac{6}{49})$

Etapa 5.5.2

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (\frac{- 18 + 6}{49} + \frac{29}{147})$

Etapa 5.5.3

Some $- 18$ e $6$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (\frac{- 12}{49} + \frac{29}{147})$

Etapa 5.5.4

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{12}{49} + \frac{29}{147})$

Etapa 5.5.5

Para escrever $- \frac{12}{49}$ como fração com um denominador comum, multiplique por $\frac{3}{3}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{12}{49} \cdot \frac{3}{3} + \frac{29}{147})$

Etapa 5.5.6

Escreva cada expressão com um denominador comum de $147$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 5.5.6.1

Multiplique $\frac{12}{49}$ por $\frac{3}{3}$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{12 \cdot 3}{49 \cdot 3} + \frac{29}{147})$

Etapa 5.5.6.2

Multiplique $49$ por $3$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{12 \cdot 3}{147} + \frac{29}{147})$

Etapa 5.5.7

Combine os numeradores em relação ao denominador comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{- 12 \cdot 3 + 29}{147}$

Etapa 5.5.8

Simplifique o numerador.

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Etapa 5.5.8.1

Multiplique $- 12$ por $3$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{- 36 + 29}{147}$

Etapa 5.5.8.2

Some $- 36$ e $29$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{- 7}{147}$

Etapa 5.5.9

Cancele o fator comum de $- 7$ e $147$ .

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Etapa 5.5.9.1

Fatore $7$ de $- 7$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{7 (- 1)}{147}$

Etapa 5.5.9.2

Cancele os fatores comuns.

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Etapa 5.5.9.2.1

Fatore $7$ de $147$ .

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{7 \cdot - 1}{7 \cdot 21}$

Etapa 5.5.9.2.2

Cancele o fator comum.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{7 \cdot - 1}{7 \cdot 21}$

Etapa 5.5.9.2.3

Reescreva a expressão.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} \cdot \frac{- 1}{21}$

Etapa 5.5.10

Mova o número negativo para a frente da fração.

$- \frac{4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6

Simplifique o determinante.

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Etapa 6.1

Simplifique cada termo.

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Etapa 6.1.1

Cancele o fator comum de $2$ .

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Etapa 6.1.1.1

Mova o negativo de maior ordem em $- \frac{4}{7}$ para o numerador.

$\frac{- 4}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.1.2

Fatore $2$ de $- 4$ .

$\frac{2 (- 2)}{7} \cdot \frac{1}{42} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.1.3

Fatore $2$ de $42$ .

$\frac{2 \cdot - 2}{7} \cdot \frac{1}{2 \cdot 21} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.1.4

Cancele o fator comum.

$\frac{2 \cdot - 2}{7} \cdot \frac{1}{2 \cdot 21} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.1.5

Reescreva a expressão.

$\frac{- 2}{7} \cdot \frac{1}{21} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.2

Multiplique $\frac{- 2}{7}$ por $\frac{1}{21}$ .

$\frac{- 2}{7 \cdot 21} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.3

Multiplique $7$ por $21$ .

$\frac{- 2}{147} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.4

Mova o número negativo para a frente da fração.

$- \frac{2}{147} - \frac{2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.5

Cancele o fator comum de $2$ .

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Etapa 6.1.5.1

Mova o negativo de maior ordem em $- \frac{2}{7}$ para o numerador.

$- \frac{2}{147} + \frac{- 2}{7} (- \frac{5}{42}) + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.5.2

Mova o negativo de maior ordem em $- \frac{5}{42}$ para o numerador.

$- \frac{2}{147} + \frac{- 2}{7} \cdot \frac{- 5}{42} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.5.3

Fatore $2$ de $- 2$ .

$- \frac{2}{147} + \frac{2 (- 1)}{7} \cdot \frac{- 5}{42} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.5.4

Fatore $2$ de $42$ .

$- \frac{2}{147} + \frac{2 \cdot - 1}{7} \cdot \frac{- 5}{2 \cdot 21} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.5.5

Cancele o fator comum.

$- \frac{2}{147} + \frac{2 \cdot - 1}{7} \cdot \frac{- 5}{2 \cdot 21} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.5.6

Reescreva a expressão.

$- \frac{2}{147} + \frac{- 1}{7} \cdot \frac{- 5}{21} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.6

Multiplique $\frac{- 1}{7}$ por $\frac{- 5}{21}$ .

$- \frac{2}{147} + \frac{- - 5}{7 \cdot 21} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.7

Multiplique $- 1$ por $- 5$ .

$- \frac{2}{147} + \frac{5}{7 \cdot 21} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.8

Multiplique $7$ por $21$ .

$- \frac{2}{147} + \frac{5}{147} + \frac{1}{7} (- \frac{1}{42}) - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.9

Multiplique $\frac{1}{7} (- \frac{1}{42})$ .

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Etapa 6.1.9.1

Multiplique $\frac{1}{7}$ por $\frac{1}{42}$ .

$- \frac{2}{147} + \frac{5}{147} - \frac{1}{7 \cdot 42} - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.9.2

Multiplique $7$ por $42$ .

$- \frac{2}{147} + \frac{5}{147} - \frac{1}{294} - \frac{1}{7} (- \frac{1}{21})$

Etapa 6.1.10

Multiplique $- \frac{1}{7} (- \frac{1}{21})$ .

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Etapa 6.1.10.1

Multiplique $- 1$ por $- 1$ .

$- \frac{2}{147} + \frac{5}{147} - \frac{1}{294} + 1 (\frac{1}{7}) \frac{1}{21}$

Etapa 6.1.10.2

Multiplique $\frac{1}{7}$ por $1$ .

$- \frac{2}{147} + \frac{5}{147} - \frac{1}{294} + \frac{1}{7} \cdot \frac{1}{21}$

Etapa 6.1.10.3

Multiplique $\frac{1}{7}$ por $\frac{1}{21}$ .

$- \frac{2}{147} + \frac{5}{147} - \frac{1}{294} + \frac{1}{7 \cdot 21}$

Etapa 6.1.10.4

Multiplique $7$ por $21$ .

$- \frac{2}{147} + \frac{5}{147} - \frac{1}{294} + \frac{1}{147}$

Etapa 6.2

Combine os numeradores em relação ao denominador comum.

$\frac{- 2 + 5 + 1}{147} + \frac{- 1}{294}$

Etapa 6.3

Some $- 2$ e $5$ .

$\frac{3 + 1}{147} + \frac{- 1}{294}$

Etapa 6.4

Some $3$ e $1$ .

$\frac{4}{147} + \frac{- 1}{294}$

Etapa 6.5

Mova o número negativo para a frente da fração.

$\frac{4}{147} - \frac{1}{294}$

Etapa 6.6

Para escrever $\frac{4}{147}$ como fração com um denominador comum, multiplique por $\frac{2}{2}$ .

$\frac{4}{147} \cdot \frac{2}{2} - \frac{1}{294}$

Etapa 6.7

Escreva cada expressão com um denominador comum de $294$ , multiplicando cada um por um fator apropriado de $1$ .

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Etapa 6.7.1

Multiplique $\frac{4}{147}$ por $\frac{2}{2}$ .

$\frac{4 \cdot 2}{147 \cdot 2} - \frac{1}{294}$

Etapa 6.7.2

Multiplique $147$ por $2$ .

$\frac{4 \cdot 2}{294} - \frac{1}{294}$

Etapa 6.8

Combine os numeradores em relação ao denominador comum.

$\frac{4 \cdot 2 - 1}{294}$

Etapa 6.9

Simplifique o numerador.

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Etapa 6.9.1

Multiplique $4$ por $2$ .

$\frac{8 - 1}{294}$

Etapa 6.9.2

Subtraia $1$ de $8$ .

$\frac{7}{294}$

Etapa 6.10

Cancele o fator comum de $7$ e $294$ .

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Etapa 6.10.1

Fatore $7$ de $7$ .

$\frac{7 (1)}{294}$

Etapa 6.10.2

Cancele os fatores comuns.

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Etapa 6.10.2.1

Fatore $7$ de $294$ .

$\frac{7 \cdot 1}{7 \cdot 42}$

Etapa 6.10.2.2

Cancele o fator comum.

$\frac{7 \cdot 1}{7 \cdot 42}$

Etapa 6.10.2.3

Reescreva a expressão.

$\frac{1}{42}$