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[函数] 一道竞赛题,内在原理是什么?

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福州小江 posted 2013-9-10 08:31 |Read mode
Last edited by hbghlyj 2025-3-19 08:12已知 $a, b, c$ 是互不相同的非零实数,且 $a+\frac{1}{b}=b+\frac{1}{c}=c+\frac{1}{a}$.求证:$|a b c|=1$.

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kuing posted 2013-9-10 10:02
原理不知道,只知道这道题很老了,好像还有推广,我找找看……

PS、你可以试着用代码打公式

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kuing posted 2013-9-10 10:04
找到了,见:wenku.baidu.com/view/068ec31fb7360b4c2e3f647e.html
至少是2006年以前的东东

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其妙 posted 2013-9-10 18:21
果然是迭代。

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Tesla35 posted 2013-9-10 19:32
罗增儒也写了一篇文章:
wenku.baidu.com/view/2fb7b6c4bb4cf7ec4afed080.html

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其妙 posted 2013-9-10 19:44
回复 5# Tesla35
    也是迭代

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kuing posted 2013-9-10 19:45
回复 5# Tesla35

好,这个更早了,2004年,注意到1#的题目是文章中的例2,而例2又引了个参考文献[2],这个文献是1997年,所以1#这道题至少是1997年前的东东……

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