初级微积分示例

$y - z = 3 - 2 x$ , $3 x - y - 3 = - 3 y$ , $2 z - 3 = x + 3 y$

解题步骤 1

Move variables to the left and constant terms to the right.

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解题步骤 1.1

在等式两边都加上 $2 x$ 。

$y - z + 2 x = 3$

$3 x - y - 3 = - 3 y$

$2 z - 3 = x + 3 y$

解题步骤 1.2

移动 $- z$ 。

$y + 2 x - z = 3$

$3 x - y - 3 = - 3 y$

$2 z - 3 = x + 3 y$

解题步骤 1.3

将 $y$ 和 $2 x$ 重新排序。

$2 x + y - z = 3$

$3 x - y - 3 = - 3 y$

$2 z - 3 = x + 3 y$

解题步骤 1.4

在等式两边都加上 $3 y$ 。

$2 x + y - z = 3$

$3 x - y - 3 + 3 y = 0$

$2 z - 3 = x + 3 y$

解题步骤 1.5

将 $- y$ 和 $3 y$ 相加。

$2 x + y - z = 3$

$3 x + 2 y - 3 = 0$

$2 z - 3 = x + 3 y$

解题步骤 1.6

在等式两边都加上 $3$ 。

$2 x + y - z = 3$

$3 x + 2 y = 3$

$2 z - 3 = x + 3 y$

解题步骤 1.7

将所有包含变量的项移到等式左边。

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解题步骤 1.7.1

从等式两边同时减去 $x$ 。

$2 x + y - z = 3$

$3 x + 2 y = 3$

$2 z - 3 - x = 3 y$

解题步骤 1.7.2

从等式两边同时减去 $3 y$ 。

$2 x + y - z = 3$

$3 x + 2 y = 3$

$2 z - 3 - x - 3 y = 0$

$2 x + y - z = 3$

$3 x + 2 y = 3$

$2 z - 3 - x - 3 y = 0$

解题步骤 1.8

在等式两边都加上 $3$ 。

$2 x + y - z = 3$

$3 x + 2 y = 3$

$2 z - x - 3 y = 3$

解题步骤 1.9

移动 $2 z$ 。

$2 x + y - z = 3$

$3 x + 2 y = 3$

$- x - 3 y + 2 z = 3$

$2 x + y - z = 3$

$3 x + 2 y = 3$

$- x - 3 y + 2 z = 3$

解题步骤 2

Write the system as a matrix.

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

解题步骤 3

求行简化阶梯形矩阵。

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解题步骤 3.1

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

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解题步骤 3.1.1

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

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

解题步骤 3.1.2

化简 $R_{1}$ 。

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

解题步骤 3.2

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

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解题步骤 3.2.1

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

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

解题步骤 3.2.2

化简 $R_{2}$ 。

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

解题步骤 3.3

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

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解题步骤 3.3.1

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

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

解题步骤 3.3.2

化简 $R_{3}$ 。

$[\begin{array}{c} 1 & \frac{1}{2} & - \frac{1}{2} & \frac{3}{2} \\ 0 & \frac{1}{2} & \frac{3}{2} & - \frac{3}{2} \\ 0 & - \frac{5}{2} & \frac{3}{2} & \frac{9}{2} \end{array}]$

解题步骤 3.4

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

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解题步骤 3.4.1

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

$[\begin{array}{c} 1 & \frac{1}{2} & - \frac{1}{2} & \frac{3}{2} \\ 2 \cdot 0 & 2 (\frac{1}{2}) & 2 (\frac{3}{2}) & 2 (- \frac{3}{2}) \\ 0 & - \frac{5}{2} & \frac{3}{2} & \frac{9}{2} \end{array}]$

解题步骤 3.4.2

化简 $R_{2}$ 。

$[\begin{array}{c} 1 & \frac{1}{2} & - \frac{1}{2} & \frac{3}{2} \\ 0 & 1 & 3 & - 3 \\ 0 & - \frac{5}{2} & \frac{3}{2} & \frac{9}{2} \end{array}]$

解题步骤 3.5

Perform the row operation $R_{3} = R_{3} + \frac{5}{2} R_{2}$ to make the entry at $3, 2$ a $0$ .

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解题步骤 3.5.1

Perform the row operation $R_{3} = R_{3} + \frac{5}{2} R_{2}$ to make the entry at $3, 2$ a $0$ .

$[\begin{array}{c} 1 & \frac{1}{2} & - \frac{1}{2} & \frac{3}{2} \\ 0 & 1 & 3 & - 3 \\ 0 + \frac{5}{2} \cdot 0 & - \frac{5}{2} + \frac{5}{2} \cdot 1 & \frac{3}{2} + \frac{5}{2} \cdot 3 & \frac{9}{2} + \frac{5}{2} \cdot - 3 \end{array}]$

解题步骤 3.5.2

化简 $R_{3}$ 。

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

解题步骤 3.6

Multiply each element of $R_{3}$ by $\frac{1}{9}$ to make the entry at $3, 3$ a $1$ .

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解题步骤 3.6.1

Multiply each element of $R_{3}$ by $\frac{1}{9}$ to make the entry at $3, 3$ a $1$ .

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

解题步骤 3.6.2

化简 $R_{3}$ 。

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

解题步骤 3.7

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

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解题步骤 3.7.1

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

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

解题步骤 3.7.2

化简 $R_{2}$ 。

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

解题步骤 3.8

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

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解题步骤 3.8.1

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

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

解题步骤 3.8.2

化简 $R_{1}$ 。

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

解题步骤 3.9

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

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解题步骤 3.9.1

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

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

解题步骤 3.9.2

化简 $R_{1}$ 。

$[\begin{array}{c} 1 & 0 & 0 & \frac{7}{3} \\ 0 & 1 & 0 & - 2 \\ 0 & 0 & 1 & - \frac{1}{3} \end{array}]$

解题步骤 4

Use the result matrix to declare the final solution to the system of equations.

$x = \frac{7}{3}$

$y = - 2$

$z = - \frac{1}{3}$

解题步骤 5

The solution is the set of ordered pairs that make the system true.

$(\frac{7}{3}, - 2, - \frac{1}{3})$

初级微积分 示例

初级微积分示例