Question

根号x加根号y分之x减y加上根号x减根号y分之x加y减2倍根号xy

求大师解答！

Answer 1

(x-y)/(√x+√y) + (x+y-2√(xy))/(√x-√y)
= (√x+√y)(√x-√y)/(√x+√y) + (√x-√y)²/(√x-√y)
= (√x-√y) + (√x-√y)
= 2(√x-√y)