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(2010•下城区模拟)如图,△ABC中,∠B=∠C=30°,点D是BC边上一点...
(2010•下城区模拟)如图,△ABC中,∠B=∠C=30°,点D是BC边上一点,以AD为直径的⊙O恰与BC边相切,⊙O交AB于E,交AC于F.过O点的直线MN分别交线段BE和CF于M,N,若AM:MB=3:5,则FC:AF的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230651758864695/SYS201310212306517588646007_ST/images0.png)
A.3:1
B.5:3
C.2:1
D.5:2
考点分析:
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