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设、、是单位向量,且,则•的最小值为( ) A.-2 B.-2 C.-1 D.1...
设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/1.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/2.png)
是单位向量,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/3.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/4.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/5.png)
的最小值为( )
A.-2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/6.png)
-2
C.-1
D.1-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356933045/SYS201310232120473569330011_ST/7.png)
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