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由式3:3x+z=-4得:z=-4-3X把Z=-4-3X代入式2:y-3z=-2得:y=-2+3z即:y=-2+3z=-2+3(-4-3x)=-2-9x=-14-9x再置y=-14-9x同入式1:2x-3y=-16得2X-3(-14-9X)=-162X-3*(-14)-3*(-9X)=-162X+42+27X=-1629X=-16-4...
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