已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值
已知x^2-7xy+12y=0,且x.y不等于0,求x^2-2xy+y^2/2xy的值
已知x-3y=0,且xy不等于0,求分式x*2-xy+y*2/x*2+xy+y*2的值
已知x²-2xy=3xy-6y² ,求x/y(y不等于0)的值
已知 xy不等于0且 3x^2 - 2xy - 8y^2=0求x/y的值!
已知xy不等于零,且3x^2-2xy-8y^2=0,求x/y的值
已知xy不等于0,且3x² -2xy-8y²=0,求x/y的值
已知2x^2-3xy+y^2=0,xy不等于零,求x/y+y/x的值
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
已知,xy不等于0,且3x方-2xy-8y方=0,则x分之y等于