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已知正项等比数列{an}满足:a7=a6+2a5,若存在两项am,an使得=4a...
已知正项等比数列{a
n}满足:a
7=a
6+2a
5,若存在两项a
m,a
n使得
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231806900843542/SYS201311012318069008435011_ST/0.png)
=4a
1,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231806900843542/SYS201311012318069008435011_ST/1.png)
的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231806900843542/SYS201311012318069008435011_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231806900843542/SYS201311012318069008435011_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231806900843542/SYS201311012318069008435011_ST/4.png)
D.不存在
考点分析:
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