已知数列
的通项公式
,其前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63dd0d0e756c828745419da1eec168a4.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06dd07bcdcf34c4cbeb9a07462407e2.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/63dd0d0e756c828745419da1eec168a4.png)
更新时间:2018-04-11 00:03:38
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适中
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解题方法
【推荐1】已知正项数列{an}的前n项和为Sn,数列{Sn}的前n项积为Tn,若Sn+2Tn=1,则数列中
最接近2019的是第____ 项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
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填空题-单空题
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适中
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【推荐2】已知数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa7ce3d748914e0937305d2d88dbedf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/a358aaceb69c54350d653cba558605a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】在数列中,
,
,
,则
的前2022项和为
您最近一年使用:0次
填空题-单空题
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适中
(0.65)
名校
解题方法
【推荐2】已知数列
满足:
,定义使
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叫做企盼数,则区间
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c5b23a4c809a5f92655108e2f8de1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a3dffbb55866598dc59b91ae6e66db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f816e1eb9dbde3c00d7c3a3f52304bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a897be1b3fd95fd1062218048ad9c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7abf751359a803499c329a8a5d47d8a.png)
您最近一年使用:0次