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x-y=-1y-z=1x+z=2
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x-y=-1y-z=1x+z=2
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答案和解析
把X-Y=-1转成X=Y-1带入另两个方程中得到Y-Z=1和Y-1+Z=2再把y-z=1换成y=1+z带入Y-1+Z=2中,解出来X=1,Y=2,Z=1;
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