1 . 已知等比数列
的前
项和为
,公比
,
,
,要使数列
为等比数列,则实数
的值为( )
![](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/f71acdb04454c77e1e25ad4f336cccfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52737376bde544dfd07eb3f1debe6fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a23819d7b9b0514c344c1620c4ad4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.2 | D.不存在 |
您最近一年使用:0次
2021-02-02更新
|
473次组卷
|
5卷引用:河南省鹤壁市2020-2021学年高二上学期期末数学理科试题
解题方法
2 . 已知等比数列
的前
项和
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cddbe3254149affeb78f1a8e480cda2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866cfa1b9d7d2afbff7f28c1a665bb05.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次