设等比数列
的公比为q,前n项和为
,若
成等差数列,则q的值为( ).
![](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/c35807c889825a792d588fdd0b9340a4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
20-21高二上·上海·课后作业 查看更多[4]
沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 本章复习题(已下线)2.5+等比数列的前n项和(1)(重点练)-2020-2021学年高二数学十分钟同步课堂专练(人教A版必修5)(已下线)4.3.2 等比数列的前n项和(1)(重点练)-2020-2021学年高二数学十分钟同步课堂专练(人教A版选择性必修第二册)新疆乌鲁木齐市第十二中学2024届高三下学期5月月考数学试题
更新时间:2020-06-26 09:33:27
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【推荐1】设
为正项等比数列
的前
项和.若
,且
,
,
成等差数列,则数列
的通项公式为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa4b2ef8b75c6cb9ebffcd23affe22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
【推荐2】记
为等比数列
的前
项和,且
,
、
、
成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c78886c192480eb5dec0ee3c61b23f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5159f58e1d0a333803ea43ed59121117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba43a00a6e133ad175bd4f27c546415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c125069bded7cf0802656e3983b58a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36243198e5e20c56399e4ad5ac3c519.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】设等比数列
的前
项和为
,已知
成等差数列,且
,则
( )
![](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/ee57ede6c75aa1f4058fd3a24081eb5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b2f064304651bf9c7fb74378357396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.3 | B.6 | C.8 | D.9 |
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