如图,在三角形ABC中,D是BC上的中点,E、F是AC边上的三等分点,即AE=EF=FC,则阴影部分的面积是三角形面 50
积的几分之几?急············································7;20之前速答可以吗?全部财富!...
积的几分之几? 急············································7;20之前速答可以吗?全部财富!
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