半圆O的直径AB=7,两弦AC、BD相交于点E,弦CD=7/2,且BD=5,则DE等于多少?A.2倍的根号2 B.4倍的根号2 C.5/3 D.5/2连接AD,OD、OC,三角形ODC是等边三角形,角DAC为30度,在直角三角形ADE中AD为2倍根号6,AE=2DE,就求出D
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![半圆O的直径AB=7,两弦AC、BD相交于点E,弦CD=7/2,且BD=5,则DE等于多少?A.2倍的根号2 B.4倍的根号2 C.5/3 D.5/2连接AD,OD、OC,三角形ODC是等边三角形,角DAC为30度,在直角三角形ADE中AD为2倍根号6,AE=2DE,就求出D](/uploads/image/z/11279234-2-4.jpg?t=%E5%8D%8A%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84AB%3D7%2C%E4%B8%A4%E5%BC%A6AC%E3%80%81BD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9E%2C%E5%BC%A6CD%3D7%2F2%2C%E4%B8%94BD%3D5%2C%E5%88%99DE%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3FA.2%E5%80%8D%E7%9A%84%E6%A0%B9%E5%8F%B72+B.4%E5%80%8D%E7%9A%84%E6%A0%B9%E5%8F%B72+C.5%2F3+D.5%2F2%E8%BF%9E%E6%8E%A5AD%2COD%E3%80%81OC%2C%E4%B8%89%E8%A7%92%E5%BD%A2ODC%E6%98%AF%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E8%A7%92DAC%E4%B8%BA30%E5%BA%A6%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2ADE%E4%B8%ADAD%E4%B8%BA2%E5%80%8D%E6%A0%B9%E5%8F%B76%2CAE%3D2DE%2C%E5%B0%B1%E6%B1%82%E5%87%BAD)
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