已知{an}的前n项和
.
(Ⅰ)求数列{an}的通项公式;
(Ⅱ)求数列
的前n项和Tn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a3115d4cc113f9a8eeb4d18ad986a5.png)
(Ⅰ)求数列{an}的通项公式;
(Ⅱ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8a3c5c2e6c4ba93d34e97d348677b1.png)
更新时间:2018-01-18 14:32:29
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【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐1】已知正项数列
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(Ⅰ)求数列
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(Ⅱ)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcf104113cdf7053acf08c69b11785c.png)
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(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐2】已知数列{an}的前n项和为Sn,对任意的正整数n,都有Sn=
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(Ⅰ)求证:{an﹣1}为等比数列;
(Ⅱ)求数列{nan}的前n项和Tn.
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