已知各项均为正数的数列{a
n}满足:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183410532560657/SYS201310241834105325606020_ST/0.png)
,设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183410532560657/SYS201310241834105325606020_ST/1.png)
,S
n=b
12+b
22+…+b
n2.
(I)求数列{a
n}的通项公式;
(II)求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183410532560657/SYS201310241834105325606020_ST/2.png)
.
考点分析:
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