若x/3=y/4=z/5≠0,求2x+y+3z/3x-2y-z的值.

若x/3=y/4=z/5,求x+y+z/3x-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+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值. 已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/（除以）x-y+z的值. 已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/x-y+z的值. 2x+3y-4z=0,3x+4y+5z=0,求x+y-z/x-y+z的值 已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值. 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 x/3=y/4=z/5,求x+y+z/3x-2y+z的值, 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值