如图,已知AD与BC相交于E,∠1=∠2=∠3,BD=CD,∠ADB=90°,CH⊥AB于H,CH交AD于F.求证(1)CD∥AB(2)△BDE≌△ACE;(3)若O为AB的中点,求证OF=1/2BR
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![如图,已知AD与BC相交于E,∠1=∠2=∠3,BD=CD,∠ADB=90°,CH⊥AB于H,CH交AD于F.求证(1)CD∥AB(2)△BDE≌△ACE;(3)若O为AB的中点,求证OF=1/2BR](/uploads/image/z/14268335-23-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5AD%E4%B8%8EBC%E7%9B%B8%E4%BA%A4%E4%BA%8EE%2C%E2%88%A01%3D%E2%88%A02%3D%E2%88%A03%2CBD%3DCD%2C%E2%88%A0ADB%3D90%C2%B0%2CCH%E2%8A%A5AB%E4%BA%8EH%2CCH%E4%BA%A4AD%E4%BA%8EF.%E6%B1%82%E8%AF%81%281%29CD%E2%88%A5AB%282%29%E2%96%B3BDE%E2%89%8C%E2%96%B3ACE%EF%BC%9B%EF%BC%883%EF%BC%89%E8%8B%A5O%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E8%AF%81OF%3D1%2F2BR)
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