x+y=8 5x-2(x+y)=-1
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x+y=8 5x-2(x+y)=-1
x+y=8 5x-2(x+y)=-1
x+y=8 5x-2(x+y)=-1
方程组整理得:
{X+Y=8……①
{3X-2Y=-1……②
①×2+②得:
5X=15,
X=3,
把X=3代入①,Y=5,
{X+3,
{Y=5.
方程可化简为x+y=8 , (1)
3x-2y=-1, (2)
将第(1)方程等式两端同乘3,可化简为3x+3y=24, (3)
(3)-(2) 得5y=25,y=5,代入(1)可得x=3
所以x=3,y=5
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