如图,△ABC的面积为1,BD=½DC,AF=½FD,CE=½EF,求DEF的面积.class="ikqb_img" src="http://h.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=46c4ea2db7fd5266a77e34129b28bb13/e1fe9925bc315c60f3a78d298cb1cb13485477c2.jpg" esrc="htt

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