如图,在△ABC中,∠C=2∠B,AD⊥AB,交BC于点D,E是BD的中点,连结AE.(1)求证:∠AEC=∠C(2)求证:BD=2AC(3)若AE=605,AD=5,求△ABE的周长不小心打错了,AE=6.5

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