根号xy除以x-y分之根号x+根号y 即：根号xy/(根号x+根号y)/(x-y)

根号xy除以x-y分之根号x+根号y 即：根号xy/(根号x+根号y)/(x-y)
根号xy除以x-y分之根号x+根号y 即：根号xy/(根号x+根号y)/(x-y)

根号xy除以x-y分之根号x+根号y 即：根号xy/(根号x+根号y)/(x-y)
√(xy)÷[(√x+√y)/(x-y)]
=√(xy)×[(x-y))/(√x+√y)]
=√(xy)×[(√x+√y)(√x-√y)/(√x+√y)]
=√(xy)×(√x-√y)
=x√y-y√x

x倍的根号y-y倍的根号x