用消元代入法解这几题,求思路和过程用代入法解下列方程组第一题4x-3y=17y=7-5x第二题3x+5y=82x-y=1第三题3x-5y=112(3x-5y)+3y=17第四题x-3y+20=03x+7y-100=0求思路和过程
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![用消元代入法解这几题,求思路和过程用代入法解下列方程组第一题4x-3y=17y=7-5x第二题3x+5y=82x-y=1第三题3x-5y=112(3x-5y)+3y=17第四题x-3y+20=03x+7y-100=0求思路和过程](/uploads/image/z/3750096-48-6.jpg?t=%E7%94%A8%E6%B6%88%E5%85%83%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%E8%BF%99%E5%87%A0%E9%A2%98%2C%E6%B1%82%E6%80%9D%E8%B7%AF%E5%92%8C%E8%BF%87%E7%A8%8B%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E7%BB%84%E7%AC%AC%E4%B8%80%E9%A2%984x-3y%3D17y%3D7-5x%E7%AC%AC%E4%BA%8C%E9%A2%983x%2B5y%3D82x-y%3D1%E7%AC%AC%E4%B8%89%E9%A2%983x-5y%3D112%283x-5y%29%2B3y%3D17%E7%AC%AC%E5%9B%9B%E9%A2%98x-3y%2B20%3D03x%2B7y-100%3D0%E6%B1%82%E6%80%9D%E8%B7%AF%E5%92%8C%E8%BF%87%E7%A8%8B)
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