解下列方程组:(1){2x+y-z=2,x+2y-z=5,x-y+z=-5;(2){2x+y+z=15,x+2y-z=5
1个回答
X=-1,Y=2,Z=-2
X=-20/3,Y=40/3,Z=15
X=1,Y=2,Z=7
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