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对复数x、y成立不? 其妙 发表于 2013-12-16 13:28
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回复 其妙 如果是复数,结论的分母中"$1+xy$"改成"$1+\overline{x}y$"即可,仍然成立 ... 007 发表于 2013-12-16 17:12
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