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平行四边形（二）—一题多证

2009-05-29 14:21:00| 分类：几何题 | 标签： |举报 |字号大中小订阅

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后记：这是笔者十分喜爱的一道题，限于时间先列出三种证法（非原创），仔细研究必有所得。

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