(a+b)(a-b)分之2ab除以2ab分之(a+b)(a-b)=

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(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)=

(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

(a+b)(a-b)分之2ab除以2ab分之(a+b)(a-b)=2ab/(a+b)(a-b)*2ab/(a+b)(a-b)=4ab/(a²-b²)²

2ab/(a+b)(a-b)÷【(a+b)(a-b)/2ab】=2ab/(a+b)(a-b)*2ab/【(a+b)(a-b)】
=4a^2b^/(a^2-b^2)^2
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2ab/(a+b)(a-b)÷【(a+b)(a-b)/2ab】=2ab/(a+b)(a-b)*2ab/【(a+b)(a-b)】
=4a^2b^/(a^2-b^2)^2
= 4a^2b^2
—————————
a^4-4a^2b^2+b^4

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