Algebra lineare Esempi

[\begin{array}{c} 4 & - 3 & 1 & 0 \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} 4 & - 3 & 1 & 0 \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

Passaggio 1

Multiply each element of

R_{1}

$R_{1}$ by

\frac{1}{4}

$\frac{1}{4}$ to make the entry at

1, 1

$1, 1$ a

1

$1$ .

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Passaggio 1.1

Multiply each element of

R_{1}

$R_{1}$ by

\frac{1}{4}

$\frac{1}{4}$ to make the entry at

1, 1

$1, 1$ a

1

$1$ .

[\begin{array}{c} \frac{4}{4} & \frac{- 3}{4} & \frac{1}{4} & \frac{0}{4} \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} \frac{4}{4} & \frac{- 3}{4} & \frac{1}{4} & \frac{0}{4} \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

Passaggio 1.2

Semplifica

R_{1}

$R_{1}$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 1 & 0 & - 2 & 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

Passaggio 2

Perform the row operation

R_{2} = R_{2} - R_{1}

$R_{2} = R_{2} - R_{1}$ to make the entry at

2, 1

$2, 1$ a

0

$0$ .

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Passaggio 2.1

Perform the row operation

R_{2} = R_{2} - R_{1}

$R_{2} = R_{2} - R_{1}$ to make the entry at

2, 1

$2, 1$ a

0

$0$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 1 - 1 & 0 + \frac{3}{4} & - 2 - \frac{1}{4} & 0 - 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 1 - 1 & 0 + \frac{3}{4} & - 2 - \frac{1}{4} & 0 - 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

Passaggio 2.2

Semplifica

R_{2}

$R_{2}$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ - 2 & 1 & 1 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ - 2 & 1 & 1 & 0 \end{array}]$

Passaggio 3

Perform the row operation

R_{3} = R_{3} + 2 R_{1}

$R_{3} = R_{3} + 2 R_{1}$ to make the entry at

3, 1

$3, 1$ a

0

$0$ .

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Passaggio 3.1

Perform the row operation

R_{3} = R_{3} + 2 R_{1}

$R_{3} = R_{3} + 2 R_{1}$ to make the entry at

3, 1

$3, 1$ a

0

$0$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ - 2 + 2 \cdot 1 & 1 + 2 (- \frac{3}{4}) & 1 + 2 (\frac{1}{4}) & 0 + 2 \cdot 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ - 2 + 2 \cdot 1 & 1 + 2 (- \frac{3}{4}) & 1 + 2 (\frac{1}{4}) & 0 + 2 \cdot 0 \end{array}]$

Passaggio 3.2

Semplifica

R_{3}

$R_{3}$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]$

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & \frac{3}{4} & - \frac{9}{4} & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]$

Passaggio 4

Multiply each element of

R_{2}

$R_{2}$ by

\frac{4}{3}

$\frac{4}{3}$ to make the entry at

2, 2

$2, 2$ a

1

$1$ .

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Passaggio 4.1

Multiply each element of

R_{2}

$R_{2}$ by

\frac{4}{3}

$\frac{4}{3}$ to make the entry at

2, 2

$2, 2$ a

1

$1$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ \frac{4}{3} \cdot 0 & \frac{4}{3} \cdot \frac{3}{4} & \frac{4}{3} (- \frac{9}{4}) & \frac{4}{3} \cdot 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ \frac{4}{3} \cdot 0 & \frac{4}{3} \cdot \frac{3}{4} & \frac{4}{3} (- \frac{9}{4}) & \frac{4}{3} \cdot 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]$

Passaggio 4.2

Semplifica

R_{2}

$R_{2}$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]$

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & - \frac{1}{2} & \frac{3}{2} & 0 \end{array}]$

Passaggio 5

Perform the row operation

R_{3} = R_{3} + \frac{1}{2} R_{2}

$R_{3} = R_{3} + \frac{1}{2} R_{2}$ to make the entry at

3, 2

$3, 2$ a

0

$0$ .

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Passaggio 5.1

Perform the row operation

R_{3} = R_{3} + \frac{1}{2} R_{2}

$R_{3} = R_{3} + \frac{1}{2} R_{2}$ to make the entry at

3, 2

$3, 2$ a

0

$0$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 + \frac{1}{2} \cdot 0 & - \frac{1}{2} + \frac{1}{2} \cdot 1 & \frac{3}{2} + \frac{1}{2} \cdot - 3 & 0 + \frac{1}{2} \cdot 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 + \frac{1}{2} \cdot 0 & - \frac{1}{2} + \frac{1}{2} \cdot 1 & \frac{3}{2} + \frac{1}{2} \cdot - 3 & 0 + \frac{1}{2} \cdot 0 \end{array}]$

Passaggio 5.2

Semplifica

R_{3}

$R_{3}$ .

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]$

[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]

$[\begin{array}{c} 1 & - \frac{3}{4} & \frac{1}{4} & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]$

Passaggio 6

Perform the row operation

R_{1} = R_{1} + \frac{3}{4} R_{2}

$R_{1} = R_{1} + \frac{3}{4} R_{2}$ to make the entry at

1, 2

$1, 2$ a

0

$0$ .

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Passaggio 6.1

Perform the row operation

R_{1} = R_{1} + \frac{3}{4} R_{2}

$R_{1} = R_{1} + \frac{3}{4} R_{2}$ to make the entry at

1, 2

$1, 2$ a

0

$0$ .

[\begin{array}{c} 1 + \frac{3}{4} \cdot 0 & - \frac{3}{4} + \frac{3}{4} \cdot 1 & \frac{1}{4} + \frac{3}{4} \cdot - 3 & 0 + \frac{3}{4} \cdot 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]

$[\begin{array}{c} 1 + \frac{3}{4} \cdot 0 & - \frac{3}{4} + \frac{3}{4} \cdot 1 & \frac{1}{4} + \frac{3}{4} \cdot - 3 & 0 + \frac{3}{4} \cdot 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]$

Passaggio 6.2

Semplifica

R_{1}

$R_{1}$ .

[\begin{array}{c} 1 & 0 & - 2 & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]

$[\begin{array}{c} 1 & 0 & - 2 & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]$

[\begin{array}{c} 1 & 0 & - 2 & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]

$[\begin{array}{c} 1 & 0 & - 2 & 0 \\ 0 & 1 & - 3 & 0 \\ 0 & 0 & 0 & 0 \end{array}]$