用代入消元法解下列方程组:(1){y=2x ,x+y=12;(2){x=2分之y-5,4x+3y=65;(3){x+y=11,x-y=7;(4)3x-2y=9,x+2y=3.
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![用代入消元法解下列方程组:(1){y=2x ,x+y=12;(2){x=2分之y-5,4x+3y=65;(3){x+y=11,x-y=7;(4)3x-2y=9,x+2y=3.](/uploads/image/z/680583-39-3.jpg?t=%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B6%88%E5%85%83%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E7%BB%84%3A%281%29%7By%3D2x+%2Cx%2By%3D12%3B%282%29%7Bx%3D2%E5%88%86%E4%B9%8By-5%2C4x%2B3y%3D65%3B%283%29%7Bx%2By%3D11%2Cx-y%3D7%3B%284%293x-2y%3D9%2Cx%2B2y%3D3.)
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