已知x+y-3z=0.x-y-z=0,求3x+2y-z分之x+y+z的值.

已知x+y-3z=0.x-y-z=0,求3x+2y-z分之x+y+z的值.
已知x+y-3z=0.x-y-z=0,求3x+2y-z分之x+y+z的值.

已知x+y-3z=0.x-y-z=0,求3x+2y-z分之x+y+z的值.
x+y-3z=0.x-y-z=0,x+y=3z,x-y=z x=2z,y=z 3x+2y-z分之x+y+z =(6z+z-z)分之(2z+z+z) =6z分之4z =2/3