等比数列
中,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c722741faba9a114739616ee9d428f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ef8696b7f9cb331e914fb2600a2319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f310d00e2b20242cf0b1941cf4084258.png)
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更新时间:2022-10-29 21:04:43
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【知识点】 求等比数列前n项和
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单选题
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适中
(0.65)
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【推荐1】若公比为
的等比数列
的前
项和为
,且
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc625e19e7ca2b9d097f67a3d472e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/3474fa71ed7c5a421230774b25968ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc625e19e7ca2b9d097f67a3d472e47.png)
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单选题
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适中
(0.65)
名校
解题方法
【推荐2】某人计划购买一辆
型轿车,售价为
万元,购买后轿车每年的保险费、汽油费、年检费、停车费等约需
万元
同时,汽车年折旧率约为
,
即这辆车每年减少它的价值的
,则大概使用多少年后,用在该车上的费用
含折旧费
达到
万元.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4700087782991cfc035b4db50d0aaaba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a637e8f4e368c079616955509b1717e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f733b1ceeead9ff892539d46a23f3626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deaf419f68f59e904a29d968787e1e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4700087782991cfc035b4db50d0aaaba.png)
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您最近一年使用:0次