已知x/2=y/3=z/4≠0,求(2x+3y+4z)/(5x-2y)的值

已知方程组4x-3y-2z=0,x-3y+z=0,z≠0求x/z,y/z的值 已知方程组2x-3y-4z=0和x+y+z=0,并且z≠0,求x：y与y：z 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 已知:2X-3y+2z=0,x+4Y-9/2z=0求:X:Z的值.X:y:Z的值.X+2y+X/X+y+Z的值. 已知:2X 已知4x-3y-6z=0,x+2y-7z=0,xyz≠0,求x-y+2z/x+y-zx-y+2z分之x+y-z 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z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4X-3y-3z=0 X-3y-Z=0求3X-2Z+Y/-x+y+Z的值 已知4X-3Y-3Z=0和X-3Y-Z=0 求3x-2z+y：-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的值. 已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z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2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,