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Re:给出公式! 不需要解析几何!

Posted by Tonitech at 2013-02-09 14:50:46 on Problem 2242
In Reply To:给出公式! 不需要解析几何! Posted by:810974380 at 2009-08-03 15:46:30
楼主这个公式是书上看来的吧。。。

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