X=-Y-2Z=1-Y根据X+Z=13得-Y-2+1-Y=13-2Y=14Y=-7X=5Z=8x-y-z=-1 1式 1式*3得 3X-3Y-3Z=-3 2式3X+5Y+7Z=11 3式2式减3式 8Y+10Z=14 Y=(14-10Z)/84X-Y+2Z=-1 4式1式减4式得 -3x-3z=0 得X=-Z将 Y=(14-10Z)/8和X=-Z代入3式...
1.解下列方程(1)(x+y=-2(x+z=13(y+z=1(2)(x-y-z=-1(3x+5y+7z=11(4x-y+
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