解下列方程组:(需过程!) 1. 4(x-y-1)=3(1-y)-2 x/2+y/3=2 2.(三元)2x+3y+z=6 x-y+2z=-1 x+2y-z=54(x-y-1)=3(1-y)-2x/2+y/3=2(三元)2x+3y+z=6x-y+2z=-1x+2y-z=5
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