1.三角形ABC中,BM为AC边上中点,N为BM上任意一点,过点N作直线EF交AB于点E,交BC于点F,且∠BEF=∠BFE,求证:EN/FN=BC/BA2.已知三角形ABC中,AE、BD为高,若CE:AE=1:根号3,AB=2倍根号3,连结DE(1)求DE的长(2)如
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![1.三角形ABC中,BM为AC边上中点,N为BM上任意一点,过点N作直线EF交AB于点E,交BC于点F,且∠BEF=∠BFE,求证:EN/FN=BC/BA2.已知三角形ABC中,AE、BD为高,若CE:AE=1:根号3,AB=2倍根号3,连结DE(1)求DE的长(2)如](/uploads/image/z/13334070-30-0.jpg?t=1.%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CBM%E4%B8%BAAC%E8%BE%B9%E4%B8%8A%E4%B8%AD%E7%82%B9%2CN%E4%B8%BABM%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2C%E8%BF%87%E7%82%B9N%E4%BD%9C%E7%9B%B4%E7%BA%BFEF%E4%BA%A4AB%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4BC%E4%BA%8E%E7%82%B9F%2C%E4%B8%94%E2%88%A0BEF%3D%E2%88%A0BFE%2C%E6%B1%82%E8%AF%81%EF%BC%9AEN%2FFN%3DBC%2FBA2.%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAE%E3%80%81BD%E4%B8%BA%E9%AB%98%2C%E8%8B%A5CE%3AAE%3D1%EF%BC%9A%E6%A0%B9%E5%8F%B73%2CAB%3D2%E5%80%8D%E6%A0%B9%E5%8F%B73%2C%E8%BF%9E%E7%BB%93DE%EF%BC%881%EF%BC%89%E6%B1%82DE%E7%9A%84%E9%95%BF%EF%BC%882%29%E5%A6%82)
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