(1/(a-b)-1/(a+b)÷b/(a^2-2ab+b^2),化简
问题描述：
(1/(a-b)-1/(a+b)÷b/(a^2-2ab+b^2),化简
答
把题目写清楚先
我没猜错的话应该是这个
[1/(a-b)-1/(a+b)]÷[b/(a^2-2ab+b^2)]
=[2b/(a-b)(a+b)]÷[b/(a-b)^2]
=2(a-b)/(a+b)