在ΔABC中,AB=3,AC=4,BC=5,ΔABD,ΔACR,ΔBCF都是等边三角形,则四边形AEFD的面积为多少,图如下
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![在ΔABC中,AB=3,AC=4,BC=5,ΔABD,ΔACR,ΔBCF都是等边三角形,则四边形AEFD的面积为多少,图如下](/uploads/image/z/3720942-54-2.jpg?t=%E5%9C%A8%CE%94ABC%E4%B8%AD%2CAB%3D3%2CAC%3D4%2CBC%3D5%2C%CE%94ABD%2C%CE%94ACR%2C%CE%94BCF%E9%83%BD%E6%98%AF%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%88%99%E5%9B%9B%E8%BE%B9%E5%BD%A2AEFD%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA%E5%A4%9A%E5%B0%91%2C%E5%9B%BE%E5%A6%82%E4%B8%8B)
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