已知5/x=4/y=3/z,z不等于0.求:3x-2y/x+y+z等于多少?

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 已知5/x=4/y=3/z,z不等于0.求:3x-2y/x+y+z等于多少? 已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为? 已知4x-3y-3z=0,① x-3y+z=0,②并且z不等于0,求x：z与y：z 已知z不等于0,x、y、z满足4x-7y-5x=0,2x-y-z=0.求x：y 已知x-4y=0,z=5x(x不等于0),求代数式x-14y+3z/x+y+z的值急 已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少 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 已知方程组4x-3y-3z=0 ,x-3y+z=0 (x,y,z,不等于0) 求x:y:z 已知4x-3y-3z= 0,x-3y+z=0中x,y,z不等于0,则x:y:z为? 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+z=0；x+3y-3z=0.并且xyz不等于0,求x,y,z的值 已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z=最好有过程 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x+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=?