a+b/a-b+a-b/a+b+4ab/b^2-a^2
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2012-02-13 · 知道合伙人教育行家
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(a+b)/(a-b) + (a-b)/(a+b) + 4ab/(b^2-a^2)
= (a+b)^2/[(a+b)(a-b)] + (a-b)^2/[(a+b)(a-b)] - 4ab/[(a+b)(a-b)]
= [(a+b)^2 + (a-b)^2 - 4ab] / [(a+b)(a-b)]
= (2a^2+2b^2-4ab) / [(a+b)(a-b)]
= 2(a-b)^2 / [(a+b)(a-b)]
= 2(a-b)/(a+b)
= (a+b)^2/[(a+b)(a-b)] + (a-b)^2/[(a+b)(a-b)] - 4ab/[(a+b)(a-b)]
= [(a+b)^2 + (a-b)^2 - 4ab] / [(a+b)(a-b)]
= (2a^2+2b^2-4ab) / [(a+b)(a-b)]
= 2(a-b)^2 / [(a+b)(a-b)]
= 2(a-b)/(a+b)
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