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1 . 由an与Sn的关系求通项公式
(1)已知数列
的前
项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70efcd7bce3216ed39911fa13993a00.png)
,求数列
的通项公式;
(2)已知正项数列
的前
项和
满足
(
).求数列
的通项公式;
(3)已知数列{an}的前n项和为Sn,a1=1,Sn=2an+1,求Sn
(4)已知正项数列
中,
,
,前n项和为
,且满足
(
).求数列
的通项公式;
(5)设数列{an}的前n项积为Tn,且Tn+2an=2(n∈N*).数列
是等差数列;求数列
的通项公式;
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70efcd7bce3216ed39911fa13993a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31eb761dbf1a5a1106dad1a25ce08a89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)已知正项数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998911f46c0c0d0cf78b29ebfbe62366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(3)已知数列{an}的前n项和为Sn,a1=1,Sn=2an+1,求Sn
(4)已知正项数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b92d8661eb91488a132dce504fd09b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c7aab4df25884973273efae244f2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(5)设数列{an}的前n项积为Tn,且Tn+2an=2(n∈N*).数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59e4ee90f2625164d23b7afcf4f002b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
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