已知x/3=y/5=z/7不等于0,则2x+3y+4z/5x-3y+z=?
已知x/3=y/5=z/7不等于0,则2x+3y+4z/5x-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+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=?
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+z
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
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3x=4y=5z,且x不等于0,求2x-3y+6z/3x-2y+4z=?
如果x/2=y/7=z/5,x,y,z都不等于0,则(x+y+z)/(3x-y)等于多少?
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知4x-3y-3z=x-3y+z=0(x、y、z不等于0)
已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z