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受欢迎的代数 >

7x+3y=15,5x+12y=39

解答

7 x + 3 y = 15, 5 x + 12 y = 39

解答

x = \frac{21}{23}, y = \frac{66}{23}

求解步骤

[7 x + 3 y = 15 5 x + 12 y = 39]

对于

7 x + 3 y = 15

将

x

移到一边:

x = \frac{15 - 3 y}{7}

替代

x = \frac{15 - 3 y}{7}

[5 \cdot \frac{15 - 3 y}{7} + 12 y = 39]

化简

[\frac{75 + 69 y}{7} = 39]

对于

\frac{75 + 69 y}{7} = 39

将

y

移到一边:

y = \frac{66}{23}

对于

x = \frac{15 - 3 y}{7}

替代

y = \frac{66}{23}

x = \frac{15 - 3 \cdot \frac{66}{23}}{7}

\frac{15 - 3 \cdot \frac{66}{23}}{7} = \frac{21}{23}

x = \frac{21}{23}

方程组的解为:

x = \frac{21}{23}, y = \frac{66}{23}

作图

流行的例子

x/5+((3y))/4 =6,((2x))/3-((3y))/2 =4

\frac{x}{5} + \frac{( 3 y )}{4} = 6, \frac{( 2 x )}{3} - \frac{( 3 y )}{2} = 4

1/7 x+y/3 =5, x/2-y/9 =6

\frac{1}{7} x + \frac{y}{3} = 5, \frac{x}{2} - \frac{y}{9} = 6

3 x + 2 y = 5, x - 3 y = 9

3x+2x+z=6,3x+y+z=5,x+y+z=3

3 x + 2 x + z = 6, 3 x + y + z = 5, x + y + z = 3

x + 2 y = 7, 2 x + 3 y = 0