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初中《几何》第二册复习参考题六的第4题,教参给出的证明显得有些繁琐,笔者有一简捷证法,现介绍如下:△ABC 中,角平分线 AD、BE 交于点 I.求证:
The fourth chapter of Geometry Book 2 in the junior middle school revises the fourth question of the reference question 6. The proof given by the teaching reference is a bit tedious. The author has a simple and straightforward proof and is introduced as follows: In ABC, the angle bisectors AD and BE are handed over to point I. Proof: