问题描述：
如图,在三角形ABC中,∠BAD=∠CAD,AD=DB,DC垂直AC,求证AB =2AC
file:///C:/Documents%20and%20Settings/Administrator/桌面/未命名.bmp
file:///C:/Documents%20and%20Settings/Administrator/桌面/未命名.bmp
问题解答：
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