怎样解方程组 2x-y+z=1 3x+y-2z=2 x+2y-z=3 ???

解方程组：x-2y+z=-1,x+y+z=2,x+2y+3z=-1 解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值 解方程组{x:y:z=1:2:3 {2x+y-3z=15 解二元一次方程组X：Y：Z=1：2：3,X+Y+Z=12 解三元一次方程组x:y:z=1:2:3 x+y+z=36 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{2x+3y+z=11,x+y+z=0,3x-y+z=-2. 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. 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6