解方程组2x+y=6 x+2y=-2 (2)2(x+1)-3(y-1)=10 2(x+1)+7(y-1)=20用加减法
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![解方程组2x+y=6 x+2y=-2 (2)2(x+1)-3(y-1)=10 2(x+1)+7(y-1)=20用加减法](/uploads/image/z/10764975-39-5.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%842x%2By%3D6+x%2B2y%3D-2+%EF%BC%882%EF%BC%892%EF%BC%88x%2B1%EF%BC%89-3%EF%BC%88y-1%EF%BC%89%3D10+2%EF%BC%88x%2B1%EF%BC%89%2B7%EF%BC%88y-1%EF%BC%89%3D20%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B3%95)
解方程组2x+y=6 x+2y=-2 (2)2(x+1)-3(y-1)=10 2(x+1)+7(y-1)=20用加减法
解方程组2x+y=6 x+2y=-2 (2)2(x+1)-3(y-1)=10 2(x+1)+7(y-1)=20
用加减法
解方程组2x+y=6 x+2y=-2 (2)2(x+1)-3(y-1)=10 2(x+1)+7(y-1)=20用加减法
x=-10/3.y=14/3
x=2/11.y=2
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