作业帮程(x+y)/8=x/3-1 2/7-y-x/2=2
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程(x+y)/8=x/3-1 2/7-y-x/2=2
程(x+y)/8=x/3-1 2/7-y-x/2=2
程(x+y)/8=x/3-1 2/7-y-x/2=2
1（1）x+y-z=4,（2)2x-y+x=5,(3)x-3y+x=-2
(1)+(2),得X=3,(1)+(3)得Y=2代入(1),Z=1
解得X=3, Y=2, Z=1.
2、(1)3x-2y=8,(2)2y+3z=1,(3)x+5z=7
(1)+(2)得X=3-Z,代入(3)得Z=1,代入(3)得
X=2,代入(2)得Y=-1.
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