化简：[√(x/y)-√(y/x)]÷[(1/√y)-(1/√x)]

化简：(x+y)÷(√x-√y)-2xy÷(x√y-y√x)答得好有赏! 化简：[√(x/y)-√(y/x)]÷[(1/√y)-(1/√x)] 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x x^/y-x-y^/y-x化简. 化简x(y-x)-y(x-y) (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 将（√x-y）/（x-y）÷√（xy/x³-x²y）（x＞y＞0）化简 化简x/y(x+y)-y/x(x+y) 化简 x / y(x+y) - y / x(x+y) = 化简:(x+ y)(x-y) +(x+ y) +(x-y) 化简y(x+y)+(x+y)(x-y)-x^2 RT,若（√2x-y）+y^2+4y+4=0,求[(x-y)^2+(x+y)(x-y)]÷2x的值 已知xy=6,x+y=-4,化简x√(x/y)+y√(y/x) （x√x+x√y)÷(xy-y^2)--(x+√xy+y)÷(x√x-y√y) √x+y-3+/xy+x+y-2/＝0,求x÷y+y÷x的值. 计算：｛x√x+x√y / xy-y²}-{x+√xy+y / x√x-y√y} 化简【(x²+y²)-(x-y)²+2y(x-y)】÷4y 化简:【(2x-y)(2x+y)+y(y+6x)】÷2x