实数数列
为等比数列,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be87d8acd149ec79f7e0664be60b9f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb5ca241bb7c313ef0366d3ddba93bc.png)
A.![]() | B.4 | C.2 | D.![]() |
更新时间:2019-03-23 17:21:12
|
【知识点】 等比数列通项公式的基本量计算
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单选题
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较易
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名校
【推荐1】等比数列
的各项和均为正数,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50ac4ed788ee66993760567249b9b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd204617a6a3c6308f59359d8bfd65e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50ac4ed788ee66993760567249b9b49.png)
A.14 | B.21 | C.28 | D.63 |
您最近一年使用:0次
单选题
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较易
(0.85)
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解题方法
【推荐2】已知等比数列
满足
,
,若
的前n项和
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0939caf47d751f8c7139bd0b25fe98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb61ab3c32c77c21924e654c0ba81a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c3661fabe3f0504302ac0b8c6dd0f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.5 | B.6 | C.7 | D.8 |
您最近一年使用:0次