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/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/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
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xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值.
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值
已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
已知:2x-3y+z=0 3x-2y-6z=0且x y z不等于0.求x^2+2y^2+2z^2/2x^2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=3y,z=7x(x不等于0),求代数式2x+3y-z分之x+y+z的值