已知直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230253202122616/SYS201311012302532021226015_ST/0.png)
与圆C
n:x
2+y
2=2a
n+n+2(n∈N
+)交于不同点A
n、B
n,其中数列a
n满足:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230253202122616/SYS201311012302532021226015_ST/1.png)
.
(Ⅰ)求数列a
n的通项公式;
(Ⅱ)设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230253202122616/SYS201311012302532021226015_ST/2.png)
,求数列b
n的前n项和S
n.
考点分析:
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=
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