已知三角形ABC的面积为1,D,F分别是BC和A上的点,E为AD和BF的交点,且BD=2/3BC,AE=ED,S表示阴影部分的S=
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![已知三角形ABC的面积为1,D,F分别是BC和A上的点,E为AD和BF的交点,且BD=2/3BC,AE=ED,S表示阴影部分的S=](/uploads/image/z/1352607-15-7.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA1%2CD%2CF%E5%88%86%E5%88%AB%E6%98%AFBC%E5%92%8CA%E4%B8%8A%E7%9A%84%E7%82%B9%2CE%E4%B8%BAAD%E5%92%8CBF%E7%9A%84%E4%BA%A4%E7%82%B9%2C%E4%B8%94BD%3D2%2F3BC%2CAE%3DED%2CS%E8%A1%A8%E7%A4%BA%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84S%3D)
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