用适当的方程解方程组2(x+y)-(x-y)=8 (x+y)-2(x-y)=15 2x+1=5(y+2) (3x+2)-
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用适当的方程解方程组2(x+y)-(x-y)=8 (x+y)-2(x-y)=15 2x+1=5(y+2) (3x+2)-2(y+7x)=16
![用适当的方程解方程组2(x+y)-(x-y)=8 (x+y)-2(x-y)=15 2x+1=5(y+2) (3x+2)-](/uploads/image/z/8746644-12-4.jpg?t=%E7%94%A8%E9%80%82%E5%BD%93%E7%9A%84%E6%96%B9%E7%A8%8B%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%842%28x%2By%29-%28x-y%29%3D8+%28x%2By%29-2%28x-y%29%3D15+2x%2B1%3D5%28y%2B2%29+%283x%2B2%29-)
用适当的方程解方程组2(x+y)-(x-y)=8 (x+y)-2(x-y)=15 2x+1=5(y+2) (3x+2)-2(y+7x)=16
2(x+y)-(x-y)=8
(x+y)-2(x-y)=15
x+3y=8(1)
3y-x=15(2)
(1)-(2)
得 2x=-7 x=-7/2
2(x+y)-(x-y)=8
(x+y)-2(x-y)=15
x+3y=8(1)
3y-x=15(2)
(1)-(2)
得 2x=-7 x=-7/2
用适当的方程解方程组2(x+y)-(x-y)=8 (x+y)-2(x-y)=15 2x+1=5(y+2) (3x+2)-
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