来自宋吉广的问题
2x-y+2=8y+2z=-23x+y-4z=1
2x-y+2=8y+2z=-23x+y-4z=1
1回答
2020-03-0703:56
2x-y+2=8y+2z=-23x+y-4z=1
2x-y+2=8y+2z=-23x+y-4z=1
①X3-③X2得14z-5y=19④
将②④组成方程组
﹛y+2z=-2②
﹛14z-5y=19④
解,得y=23/12,z=24/9