若X》0,Y》0,XY=4X+Y,求X+Y的最小值

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*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? 若X》0,Y》0,XY=4X+Y,求X+Y的最小值 已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y) 已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y） 若集合{x,xy,lg(xy)}={0,|x|,y},求log8(x^2+y^2) 若2x+y=0,求(x^2+xy+y^2)/(2xy-x^2) 若x²-4xy+5y²-2y+1=0,求x,y 若x,y 为正整数.x^2+y^2+4y-96=0,求xy 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若x+y=6,xy=2.75,x-y>0,求x-y的值 若正整数X,Y满足2X+Y--XY=0,求X+Y的最小值 x*x+y*y+4x-6y+13=0求xy=? 已知x,y>0 2x+y+3=xy 求5x+4y最小值 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 若3x^2+xy-2y^2=0,求（x+y/x-y+4xy/y^2-x^2)除以(x^2+2xy-3y^2/x^2-9y^2)的值 设x+y=0 ,xy=11,求x*x-xy+y*y 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x