如图 在△ABC中,AB=AC,BD=CD,DE⊥AB于点E,DF⊥AC于点F,试说明DE=DF
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![如图 在△ABC中,AB=AC,BD=CD,DE⊥AB于点E,DF⊥AC于点F,试说明DE=DF](/uploads/image/z/3803642-26-2.jpg?t=%E5%A6%82%E5%9B%BE+%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2CBD%3DCD%2CDE%E2%8A%A5AB%E4%BA%8E%E7%82%B9E%2CDF%E2%8A%A5AC%E4%BA%8E%E7%82%B9F%2C%E8%AF%95%E8%AF%B4%E6%98%8EDE%3DDF)
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