(2x+y-z)+(x+2y+z)=2+4=6
3(x+y)=6
x+y=2
3(2x+y-z)+(x-2y+3z)=2*3+2=8
7x+y=8
联立上面2个方程,成为一个方程组
7x+y-x-y=8-2=6
6x=6
x=1
y=1
z=1
2x+y-z=2 x+2y+z=4 x-2y+3z=2
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