解方程组2x+3y+z=6 x-y+2z=-1解方程组2x+3y+z=6 x-y+2z=-1 x+2y-z=5

问题描述:

解方程组2x+3y+z=6 x-y+2z=-1
解方程组2x+3y+z=6 x-y+2z=-1 x+2y-z=5