计算题:根号xy除以x-y分之根号x+根号y。
题目可能乱了点哈、、但是还是希望大家能够帮忙!~~
√(xy)/[(√x+√y)/(x-y)]
=√(xy)/{(√x+√y)/[(√x-√y)(√x+√y)]}
=√(xy)/[1/(√x-√y)]
=√(xy)(√x-√y)
=x√y-y√x