已知2x/y+3y/x=-5,则4x^2+10XY+6Y^2/2X^2+3Y^2=

已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知实数x,y满足y=x^2+5x-4,则3x-2y最大值为 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知x^2+y^2-4x+2y+5=0则x^y=? 已知x^2+4x+y^2+2y+5=0,则x^y= 已知3x-4y=0,则x^2-y^2/x^2+y^2 已知x-y=3则5(x-y)-3x+3y-2= 已知x-y=3则5(x-y)-3x+3y-2= 已知x²+4x+y²-2y+5=0,则x+y= 已知-x+y=3,则2(x-y)2次方-4(x-y)+6 已知|5x-y-8|+(7y-x+2)=0则4x+6y 已知y/x=2,则求代数式x+y/4x-5y的值 已知4x=5y,那么(3x+y)/(x-2y)= 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.