(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)=
答
(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