问题描述:
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="http://h.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=ce2b78ee962bd4074292dbf94eb9b267/e1fe9925bc315c60f3a78d298cb1cb13485477c2.jpg" />
class="ikqb_img" src="http://h.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=46c4ea2db7fd5266a77e34129b28bb13/e1fe9925bc315c60f3a78d298cb1cb13485477c2.jpg" esrc="http://h.hiphotos.baidu.com/zhidao/wh%3D450%2C600/sign=ce2b78ee962bd4074292dbf94eb9b267/e1fe9925bc315c60f3a78d298cb1cb13485477c2.jpg" />
问题解答:
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