求解二元一次方程组,3x-4(x-y)=2 ① 2x-3y=7②; 2(x+y)-(x-y)=3① (x+y)-2(x-y)=1②x y 1— - —= —①3 7 2x y 1—+ —= —②3 7 39点之前最好 x-y x+y——=——①3 22x-5y=7②第一题答错了 是3x-4(x-
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![求解二元一次方程组,3x-4(x-y)=2 ① 2x-3y=7②; 2(x+y)-(x-y)=3① (x+y)-2(x-y)=1②x y 1— - —= —①3 7 2x y 1—+ —= —②3 7 39点之前最好 x-y x+y——=——①3 22x-5y=7②第一题答错了 是3x-4(x-](/uploads/image/z/90691-43-1.jpg?t=%E6%B1%82%E8%A7%A3%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%2C3x-4%EF%BC%88x-y%EF%BC%89%3D2+%E2%91%A0+2x-3y%3D7%E2%91%A1%EF%BC%9B+2%EF%BC%88x%2By%EF%BC%89-%EF%BC%88x-y%EF%BC%89%3D3%E2%91%A0+%EF%BC%88x%2By%EF%BC%89-2%EF%BC%88x-y%EF%BC%89%3D1%E2%91%A1x+y+1%E2%80%94+-+%E2%80%94%3D+%E2%80%94%E2%91%A03+7+2x+y+1%E2%80%94%2B+%E2%80%94%3D+%E2%80%94%E2%91%A13+7+39%E7%82%B9%E4%B9%8B%E5%89%8D%E6%9C%80%E5%A5%BD+x-y+x%2By%E2%80%94%E2%80%94%3D%E2%80%94%E2%80%94%E2%91%A03+22x-5y%3D7%E2%91%A1%E7%AC%AC%E4%B8%80%E9%A2%98%E7%AD%94%E9%94%99%E4%BA%86+%E6%98%AF3x-4%EF%BC%88x-)
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