化简(x-y)/(根号x+根号y)

问题描述:

化简(x-y)/(根号x+根号y)

(x-y)/(根号x+根号y)
=((根号x)²-(根号y)²)/(根号x+根号y)
=(根号x-根号y)(根号x+根号y)(根号x+根号y)
=根号x-根号y