(1/a-b-1/a+b)/[b/(a^2-2ab+b^2)] （因式分解）化简

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(1/a-b-1/a+b)/[b/(a^2-2ab+b^2)] （因式分解）化简
(1/a-b-1/a+b)/[b/(a^2-2ab+b^2)] （因式分解）化简

(1/a-b-1/a+b)/[b/(a^2-2ab+b^2)] （因式分解）化简
(1/a-b-1/a+b)/[b/(a^2-2ab+b^2)] =[2b/(a+b)(a-b)]/[b/(a-b)^2 =[2b/(a+b)(a-b)]*(a-b)^2/b =2(a-b)/(a+b)
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