已知
为等差数列,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6746f814078c1dbb603165264a9b1b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
A.21 | B.17 | C.23 | D.20 |
更新时间:2024-04-30 12:47:55
|
【知识点】 等差数列通项公式的基本量计算
相似题推荐
单选题
|
较易
(0.85)
名校
解题方法
【推荐1】已知等差数列
,
是其前
项和,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0556f0d870422056379409ba036b46.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
【推荐2】由
确定的等差数列
,当
=98时,序号n等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4302603a04161fbbaef6286a77e108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
A.99 | B.33 | C.11 | D.22 |
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