已知等差数列
的首项和公差均不为0,且满足
,
,
成等比数列,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c127529382ed69d011e8833cde75caf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-04-06 22:23:25
|
相似题推荐
单选题
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【推荐1】已知
是各项为正数的等比数列,公比为
是等差数列,公差为
,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72b06581842d94fc34090efb90af3de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92235068655803c8e1e401f0d5da0888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5823260720a9992176dfa83e85ea33bd.png)
A.4 | B.0 | C.![]() | D.2 |
您最近一年使用:0次
单选题
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较易
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【推荐1】在3和9之间插入两个正数后,使前三个数成等比数列,后三个数成等差数列,则这两个正数之和为( )
A.![]() | B.![]() | C.![]() | D.10 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】等差数列
的公差为2,若
成等比数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ad6b9e7f1c2c4a5a3025ba57e71b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次