已知数列{an}的前n项和为Sn,满足:a2=2a1,且Sn=
+1(n≥2),则数列{an}的通项公式为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54d2760ef31812e73d951734ae015db2.png)
更新时间:2019-09-12 18:25:58
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【知识点】 由Sn求通项公式
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