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2x=3y=4z求2x-y+z分之x+y+z的值
已知x:y:z=2:3:4求x-y+z分之x+y-z的值
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知x=3y,z=7y(x≠0),求代数式2x+3y-z分之x+y+z的值
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
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少
已知x+y-z=0,2x-y+2z=0 求(3x-2y+5z)/(5x-3y+2z)的值
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值