求方程组[(x+y+z=10) (3x+y-z=50) (2x+y=40)]有多少组解,

求方程组[(x+y+z=10) (3x+y-z=50) (2x+y=40)]有多少组解, 解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值 x/2=y/3=z/4 x+y+z=18 求方程组解 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 解方程组x+y+z=30,3x+2y+z=50 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{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：x-2y+z=-1,x+y+z=2,x+2y+3z=-1 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.