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(2002•西城区)如图,△ABC中,DE∥BC,如果AD=1,DB=2,那么的...
(2002•西城区)如图,△ABC中,DE∥BC,如果AD=1,DB=2,那么
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的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247034907/SYS201310212328072470349009_ST/images1.png)
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247034907/SYS201310212328072470349009_ST/2.png)
C.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247034907/SYS201310212328072470349009_ST/4.png)
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