解下列线性方程组x1+2x2+3x3=4,3x1+6x2+x3=2,2x1+4x2+x3=-2我不懂第三步为什么把-8化成1,把-5化成1
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![解下列线性方程组x1+2x2+3x3=4,3x1+6x2+x3=2,2x1+4x2+x3=-2我不懂第三步为什么把-8化成1,把-5化成1](/uploads/image/z/3023683-43-3.jpg?t=%E8%A7%A3%E4%B8%8B%E5%88%97%E7%BA%BF%E6%80%A7%E6%96%B9%E7%A8%8B%E7%BB%84x1%2B2x2%2B3x3%3D4%2C3x1%2B6x2%2Bx3%3D2%2C2x1%2B4x2%2Bx3%3D-2%E6%88%91%E4%B8%8D%E6%87%82%E7%AC%AC%E4%B8%89%E6%AD%A5%E4%B8%BA%E4%BB%80%E4%B9%88%E6%8A%8A-8%E5%8C%96%E6%88%901%2C%E6%8A%8A-5%E5%8C%96%E6%88%901)
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