X根号下(1/Y^2—2/XY+1/X^2) (X>Y>0)
(x*根号下x + x*根号下y ) / (xy-y^2) — (x + 根号下xy + y) /(x*根号下x — y
(x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.
【(x-y)^3(x^1/2+y^1/2)^-3+3(x根号y-y根号x)】/(x根号x+y根号y)+(2xy根号xy-
[x-y]根号下 1/y-x +根号下 x的平方-2xy+y的平方 化简
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y
求极限((1-根号下x^2+1)/x^3y^2)sin(xy),当x,y趋于0时
若X>0,y>0,且x-根号下xy-2y=0,求(2x-根号下xy)/y+2根号下xy的值
若x>0,y>0,且x-根号下xy-2y=0,求【2x-根号下xy】÷【y+2根号下xy】的值
根号下(x^2-2xy+y^2/xy)化简 x>y>0
根号下(x^2-2xy+y^2/xy)化简 (x>y>0)
已知X+Y=—3,XY=2求根号下x/y+根号下y/x的值