数列前
项和
,则该数列的第4项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf81feabb82d722a582438fc60b10521.png)
A.19 | B.20 | C.21 | D.22 |
23-24高三上·山东潍坊·期中 查看更多[4]
山东省潍坊市国开中学2024届高三上学期期中数学试题内蒙古通辽市科左中旗民族职专·实验高中2023-2024学年高二上学期期末数学试题(已下线)专题08 求数列通项17种常见考法归类(4)(已下线)重难点5-1 数列通项公式的求法(8题型+满分技巧+限时检测)
更新时间:2023-12-19 21:16:19
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【知识点】 利用an与sn关系求通项或项
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单选题
|
较易
(0.85)
名校
解题方法
【推荐1】已知数列满足
,设
,则数列
的前2023项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f3a0b0633fbbc1a1aac38240afc3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0f044dc82a12fd1c71872f2ac12d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da72309d2507e2f5e5ed88d8cc08963.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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单选题
|
较易
(0.85)
【推荐2】记数列
的前n项和为
,已知向量
,
,若
,且
,则对于任意的
,下列结论正确的是( )
![](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/791e9c00c9ec9b69064a57a31f6b1007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee7a3e6bfc638103da1251ca6f93651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32b6dc307d12bbd6b850a67b0599620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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