x+y-z=0①,2x-3y+2z=5②,x+2y-z=3③,①-③=x+y-z-﹙x+2y-z﹚=﹣3,y=3,将y=3代入①②中分别为,x-z=﹣3④,x+z=7⑤,④﹢⑤=2x=4,x=2,将x=2,y=3代入①中,z=5.所以x=2,y=3,z=5
x+y-z=0 2x-3y+2z=5 x+2y-z=3
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