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设等比数列{an}的前n项和为Sn,若=3,则=( ) A.2 B. C. D....
设等比数列{a
n}的前n项和为S
n,若
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=3,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698005_ST/1.png)
=( )
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698005_ST/3.png)
D.3
考点分析:
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平面向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698002_ST/0.png)
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的夹角为60°,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698002_ST/2.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698002_ST/3.png)
|=1,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698002_ST/4.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698002_ST/6.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281069828/SYS201310241835252810698002_ST/7.png)
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