解方程组,2x+3y+4z=29 x：y：z=2：3：4

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 解三元一次方程组：x+y+z=6,y-z=4,x-y-2z=3, 解方程组:x+2y+3z=80,x/2+y/3=z/4, 解方程组：{x/2=y/3=z/4 2x+y+z=22 解方程组x+2y+3z=根号(x+2y+3z+2)+4 解方程组x:y:z=2:3:4;2x+y+z=22 x/2=y/3=z/4 x+y+z=18 求方程组解 解方程组{6x=4y=3z,2x+y+z=22 解方程组：2x+3y+4z=20,x+y+z=7