帮我解方程组：3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=?

帮我解方程组：3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=? 解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2. 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3 解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 解方程组：x-2y+z=-1,x+y+z=2,x+2y+3z=-1 解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7. x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组. 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 方程组x=2y=3z x+y+z=11的解 方程组{x=2y=3z x+y+z=11 的解是