y-2x=17 (1)
5x+3y+2z=2 (2)
3x-4z=4 (3)
由(1)得y=2x+17,由(3)得z=3x/4 -1,代入(2)
5x+3(2x+17)+2(3x/4 -1)=2
整理,得
25x/2=-47
x=-94/25
y=2x+17=-188/25 +17=237/25
z=3x/4 -1=(3/4)(-94/25) -1=-191/50
x=-94/25 y=237/25 z=-191/50
y-2x=17,5x+3y+2z=2,3x-4z=4求xyz的值
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