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《数学天书中的证明》给出了好几种证明 Tesla35 发表于 2014-4-11 09:34
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realnumber 发表于 2014-4-9 02:57 $\frac{\pi ^2}{6}$ wenku.baidu.com/link?url=Rpz5V1XK9e9B1Op7ADRk … bUkvRPtlpg2VlEAXQydS
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