已知5x+3y=3z,-x-3y+z=0,求x:y:z

已知5x+3y=3z,-x-3y+z=0,求x:y:z 已知方程组3x+5y+3z=0,3x-5y-8z=0,并且z≠0,求x:z和y:z 已知x+y-z=0,2x-y+2z=0 求（3x-2y+5z)/(5x-3y+2z)的值 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x：y：z的值 已知x+2y-3z=0,2x+3y+5z=0,求(x+y+z)除以（x-y+z) 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3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z) 已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z, 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-