已知x/3=y/5=z/4不等于0,则x+2y+3z / 2x-3y+z=?

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/3=y/5=z/7不等于0,则2x+3y+4z/5x-3y+z=? 已知x+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=? 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 已知3x=4y=5z,且x不等于0,求2x-3y+6z/3x-2y+4z=? 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 已知4x-3y-3z=x-3y+z=0(x、y、z不等于0) 已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z= 已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z 已知x,y,z满足{4x-3y-3z=0,x-3y+z=0.（x不等于0,y不等于0,z不等于0）求x/z和y/z的值