解方程组x-3y+4z=-1,2x-y=5,2x+y-z=7/4

解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 解方程组：2x+3y+4z=20,x+y+z=7 解方程组:{3x+2y+2z=-1 4x-3y-5z=12 2x+6y+7z=-1 方程组x+2y+3z=6 3x-y-z=1 4x+5y-7z=2的解 求三元一次方程组的解有过程 x-y-z=1 3x+5y+7z=11 4x-y+2z=-1 解方程组：x-y-z=-1,3x+5y+7z=11,4x-y+2z=-1 解方程组:{x-y-z=-1,3x+5y+7z=11,4x-y+2z=-1 x-y-z=-1,3x+5y+7z=11,4x-y+2z=-1.方程组的解是什么? 解方程组2x+y-z=7 x+y+z =1 2x-y-z=5 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 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.