初一课本求三道三元一次方程组解题~!
x=2y-3
3x+y-2z=5
x+2y+3=0
2x+3y=11
3x-y+2z=7
x+y-4z=-9
4x-y=2
2x+3y+2z=12
3x+2y-z=5
请列出详细过程谢啦~!!!