已知等差数列
的首项为
,公差为
是其前
项和.若存在
,使得
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3f042edc76e87a9a011985e991b43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd2c3166d0bfd9e64bdc85081445e95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ad05578d9b41353978c591fa6e58e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.15 | D.16 |
22-23高三上·河南·期末 查看更多[3]
更新时间:2023-01-15 19:59:19
|
相似题推荐
【推荐1】已知等差数列
,
,前
项和为
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997d13080fa429dda4af263eb7ac26c1.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/bfd5c5cb4db3b5ebfd18081d43f54b3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2778e2dadff4d91102e6046bb5def8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】设等差数列{an}的公差为2,前10项和为490,等差数列{bn}的公差为4,前10项和为240.以ak,bk为邻边的矩形内的最大圆的面积记为Sk,若k≤18,则Sk=( )
A.π(2k+1)2 | B.π(2k+3)2 | C.π(k+1)2 | D.π(k+18)2 |
您最近一年使用:0次
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适中
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名校
【推荐2】已知各项均为正的等比数列
中,
与
的等比中项为
,则
的最小值是
![](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/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ed6315c21c5b9ff59b1aa0518dc09a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次