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设函数f(x)=xm+ax的导函数f′(x)=2x+1,则数列{}(n∈N*)的...
设函数f(x)=x
m+ax的导函数f′(x)=2x+1,则数列{
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629976555/SYS201310241829196299765005_ST/0.png)
}(n∈N
*)的前n项和是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629976555/SYS201310241829196299765005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629976555/SYS201310241829196299765005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629976555/SYS201310241829196299765005_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629976555/SYS201310241829196299765005_ST/4.png)
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