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如图,菱形ABCD中,∠BAD=60°,M是AB的中点,P是对角线AC上的一个动...
如图,菱形ABCD中,∠BAD=60°,M是AB的中点,P是对角线AC上的一个动点,若PM+PB的最小值是3,则AB长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656221670258/SYS201310221606562216702007_ST/images0.png)
A.3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656221670258/SYS201310221606562216702007_ST/0.png)
C.6
D.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656221670258/SYS201310221606562216702007_ST/1.png)
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