x^2+y^2=20 x^2-5xy+6y^2=0

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 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y* 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? x^2+xy+x=36,y^2+xy+y=20,求x+y. 已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·（5/x+y）-（y/x-y 7.X*X+2X+Y*Y-6Y+10=0,则xy=? 已知x>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy √x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y ∫x(∫x+2∫y)=∫y(6∫x+5∫y),求：（x+∫xy-y)/(2x+∫xy+3y)