Đại số tuyến tính Ví dụ

$[\begin{array}{c} 1 & - 4 & 2 \\ - 2 & 8 & - 9 \\ - 1 & 7 & 0 \end{array}]$

Bước 1

Perform the row operation $R_{2} = R_{2} + 2 R_{1}$ to make the entry at $2, 1$ a $0$ .

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Bước 1.1

Perform the row operation $R_{2} = R_{2} + 2 R_{1}$ to make the entry at $2, 1$ a $0$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ - 2 + 2 \cdot 1 & 8 + 2 \cdot - 4 & - 9 + 2 \cdot 2 \\ - 1 & 7 & 0 \end{array}]$

Bước 1.2

Rút gọn $R_{2}$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ 0 & 0 & - 5 \\ - 1 & 7 & 0 \end{array}]$

Bước 2

Perform the row operation $R_{3} = R_{3} + R_{1}$ to make the entry at $3, 1$ a $0$ .

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Bước 2.1

Perform the row operation $R_{3} = R_{3} + R_{1}$ to make the entry at $3, 1$ a $0$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ 0 & 0 & - 5 \\ - 1 + 1 \cdot 1 & 7 - 4 & 0 + 1 \cdot 2 \end{array}]$

Bước 2.2

Rút gọn $R_{3}$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ 0 & 0 & - 5 \\ 0 & 3 & 2 \end{array}]$

Bước 3

Swap $R_{3}$ with $R_{2}$ to put a nonzero entry at $2, 2$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ 0 & 3 & 2 \\ 0 & 0 & - 5 \end{array}]$

Bước 4

Multiply each element of $R_{2}$ by $\frac{1}{3}$ to make the entry at $2, 2$ a $1$ .

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Bước 4.1

Multiply each element of $R_{2}$ by $\frac{1}{3}$ to make the entry at $2, 2$ a $1$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ \frac{0}{3} & \frac{3}{3} & \frac{2}{3} \\ 0 & 0 & - 5 \end{array}]$

Bước 4.2

Rút gọn $R_{2}$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ 0 & 1 & \frac{2}{3} \\ 0 & 0 & - 5 \end{array}]$

Bước 5

Multiply each element of $R_{3}$ by $- \frac{1}{5}$ to make the entry at $3, 3$ a $1$ .

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Bước 5.1

Multiply each element of $R_{3}$ by $- \frac{1}{5}$ to make the entry at $3, 3$ a $1$ .

$[\begin{array}{c} 1 & - 4 & 2 \\ 0 & 1 & \frac{2}{3} \\ - \frac{1}{5} \cdot 0 & - \frac{1}{5} \cdot 0 & - \frac{1}{5} \cdot - 5 \end{array}]$

Bước 5.2

Rút gọn $R_{3}$ .

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

Bước 6

Perform the row operation $R_{2} = R_{2} - \frac{2}{3} R_{3}$ to make the entry at $2, 3$ a $0$ .

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Bước 6.1

Perform the row operation $R_{2} = R_{2} - \frac{2}{3} R_{3}$ to make the entry at $2, 3$ a $0$ .

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

Bước 6.2

Rút gọn $R_{2}$ .

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

Bước 7

Perform the row operation $R_{1} = R_{1} - 2 R_{3}$ to make the entry at $1, 3$ a $0$ .

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Bước 7.1

Perform the row operation $R_{1} = R_{1} - 2 R_{3}$ to make the entry at $1, 3$ a $0$ .

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

Bước 7.2

Rút gọn $R_{1}$ .

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

Bước 8

Perform the row operation $R_{1} = R_{1} + 4 R_{2}$ to make the entry at $1, 2$ a $0$ .

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Bước 8.1

Perform the row operation $R_{1} = R_{1} + 4 R_{2}$ to make the entry at $1, 2$ a $0$ .

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

Bước 8.2

Rút gọn $R_{1}$ .

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