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

已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 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{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. 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2x=3y=4z求2x-y+z分之x+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/4=y/5=z/6 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. 已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值 已知x:y:z=2:3:4求x-y+z分之x+y-z的值