已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z=
4个回答
解
2x-3y+5z=7 (1)
x+2y-3z=8 (2)
(2)*2+(1)得:
2x+2x+y-z=16+7
4x+y-z=23
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