(a+b)(a-b)分之2ab除以2ab分之(a+b)(a-b)=

问题描述:

(a+b)(a-b)分之2ab除以2ab分之(a+b)(a-b)=

(a+b)(a-b)分之2ab除以2ab分之(a+b)(a-b)=
[2ab/(a+b)(a-b)]÷[(a+b)(a-b)/2ab]=[2ab/(a²-b²)]×[2ab/(a²-b²)]=4a²b²/(a²-b²)²