已知等比数列
的公比为q,前n项和为
.若
,
,则
( )
![](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/26d9b6c86435e0ceff94d8ad1cd03737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c970689f7cfbd9a18375f0bbf184e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9620357ea5be4037cfdccd09a27d3862.png)
A.-24 | B.-28 | C.-30 | D.-32 |
22-23高二下·北京海淀·期中 查看更多[2]
北京市海淀区清华大学附属中学永丰学校2022~2023学年高二下学期期中调研数学试题(已下线)第4.3.2讲 等比数列的前n项和公式(第1课时)-2023-2024学年新高二数学同步精讲精练宝典(人教A版2019选修第二、三册)
更新时间:2023-07-09 08:21:47
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【推荐1】在等比数列
中,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cde0cb9794ce183ef69453d4576dfea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c273b7656ae822a6d802c09396e49bcd.png)
A.18 | B.21 | C.24 | D.48 |
您最近一年使用:0次
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容易
(0.94)
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解题方法
【推荐1】设等比数列
的公比
,前
项和为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f45f5bc7c648c0e8924b4fa7b1ad08.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/481e6af1ec33f110797d22906a2fbeb1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】已知数列
满足
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9394369ac369bd4608fbe406868f507a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ce9d5623b21817dd182b9058dc271a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62932fadeb949d049f13360502622fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9394369ac369bd4608fbe406868f507a.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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