已知5X-4Y-7Y=0,4X-3Y-6Z=0,则X：Y：Z=?

已知方程组4x-5y+2z=0 x+2y=3z 则x:y: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,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z 已知4x-3y-6y=0,x+2y-7z=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. 已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y- 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 已知3X=4X,5Y=6Z求X+Y：Y+Z 已知 x-3y+z=0 3x-3y-4z=0,则x:y:z= 已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?