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八年级：若CE平分∠ACB，CE=5，怎么求BF的长？怎么添加辅助线？
八年级：若CE平分∠ACB，CE=5，怎么求BF的长？怎么添加辅助线？三角形全等，直角三角形斜边上的中线等于斜边的一半。
初中数学，三角形角平分线，基础训练，培优专题5/57
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