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1问题的提出一位初三学生向笔者提出如下一个问题:ABCD为平行四边形,E、F分别在AD、AB上,BE、DF交于O点,且BE=DF,证明:CO平分∠BOD.图1这是一个很有趣的题目.别看它的形式很简单,但是做起来却并不那么轻
1 Problem Proposal A junior high school student asked the author the following question: ABCD is a parallelogram, E, F are on AD, AB, BE, DF are intersected at O, and BE = DF, which proves that: CO splits BOD Figure 1 This is a very interesting topic. Do not look at it in the form of simple, but it is not so light