题目

（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 ..

提问时间：2021-01-07

答案

（x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3
=（x+y）^(6-4)-(x-y)^(5-3)
=（x+y）^2-(x-y)^2
=(x+y+x-y)(x+y-x+y)
=(2x)(2y)
=4xy