y=3-2x－－－A
由2式-3式可得
3x-y+z-x-2y-z=-5
2x-3y=-5
将A式带入
2x-9+6x=-5
x=1/2
带入
y=2
带入
z=17/2
{2x+y=3,3x-y+z=8,x+2y+z=13
2个回答
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