如图,在梯形ABCD中,AD//BC,AB=DC,∠ADC=120°,对角线CA平分∠DCB,E为BC的中点,试求△DCE与四边形ABED的面积之比.
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![如图,在梯形ABCD中,AD//BC,AB=DC,∠ADC=120°,对角线CA平分∠DCB,E为BC的中点,试求△DCE与四边形ABED的面积之比.](/uploads/image/z/11651697-9-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%2F%2FBC%2CAB%3DDC%2C%E2%88%A0ADC%3D120%C2%B0%2C%E5%AF%B9%E8%A7%92%E7%BA%BFCA%E5%B9%B3%E5%88%86%E2%88%A0DCB%2CE%E4%B8%BABC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%AF%95%E6%B1%82%E2%96%B3DCE%E4%B8%8E%E5%9B%9B%E8%BE%B9%E5%BD%A2ABED%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B9%8B%E6%AF%94.)
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