18、已知:如图,BC为半圆的直径,O为圆心,D是弧AC的中点,四边形ABCD的对角线AC、BD交于点E.1)试判断:△ABE相似于△DBC成立吗?2)已知BC=5/2,CD=根号5/2,求AB:BE的值3)在2)的条件下,求弦AB的长
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![18、已知:如图,BC为半圆的直径,O为圆心,D是弧AC的中点,四边形ABCD的对角线AC、BD交于点E.1)试判断:△ABE相似于△DBC成立吗?2)已知BC=5/2,CD=根号5/2,求AB:BE的值3)在2)的条件下,求弦AB的长](/uploads/image/z/6121857-57-7.jpg?t=18%E3%80%81%E5%B7%B2%E7%9F%A5%EF%BC%9A%E5%A6%82%E5%9B%BE%2CBC%E4%B8%BA%E5%8D%8A%E5%9C%86%E7%9A%84%E7%9B%B4%E5%BE%84%2CO%E4%B8%BA%E5%9C%86%E5%BF%83%2CD%E6%98%AF%E5%BC%A7AC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E3%80%81BD%E4%BA%A4%E4%BA%8E%E7%82%B9E.1%EF%BC%89%E8%AF%95%E5%88%A4%E6%96%AD%EF%BC%9A%E2%96%B3ABE%E7%9B%B8%E4%BC%BC%E4%BA%8E%E2%96%B3DBC%E6%88%90%E7%AB%8B%E5%90%97%3F2%29%E5%B7%B2%E7%9F%A5BC%3D5%2F2%2CCD%3D%E6%A0%B9%E5%8F%B75%2F2%2C%E6%B1%82AB%EF%BC%9ABE%E7%9A%84%E5%80%BC3%EF%BC%89%E5%9C%A82%EF%BC%89%E7%9A%84%E6%9D%A1%E4%BB%B6%E4%B8%8B%2C%E6%B1%82%E5%BC%A6AB%E7%9A%84%E9%95%BF)
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