已知各项均为正数的等比数列
,满足
,若存在不同两项
使得
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3115a45296a1f6e64ac14851f15305ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2320fcc6aaa1d36b49f8e03b376b80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313c99ad28c4f0752babcc64d1325c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd93ee03569849295ebde055410d1b84.png)
A.9 | B.![]() | C.![]() | D.![]() |
更新时间:2024-04-03 21:18:15
|
【知识点】 等比数列通项公式的基本量计算
相似题推荐
单选题
|
适中
(0.65)
解题方法
【推荐1】等比数列
前
项和为
,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/181967fe81f94621cb446130c99c3121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29504c7d9517e6ffb07ae09c19f34f08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
A.81 | B.96 | C.108 | D.192 |
您最近一年使用:0次
【推荐2】在各项均为正数的等比数列
中,公比
,若
,
,数列
的前n项和为Sn,则
取最大值时,n的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae99e050d0f1cfc0447304f06424d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c315aac51d58443cd89767e4eefc09f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55493a358d77b09ba82e88c8ba3a25cb.png)
A.8 | B.8或9 | C.9 | D.17 |
您最近一年使用:0次