数列{a
n}满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801023_ST/0.png)
若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801023_ST/1.png)
,则a
8=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801023_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801023_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801023_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801023_ST/5.png)
考点分析:
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183525281080184/SYS201310241835252810801018_ST/0.png)
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