已知公差不为0的等差数列
满足
成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb930b4b569676616f66f483fcef84a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed77b69c02cb6ac309d113599e2062e9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-04-12 21:15:08
|
【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
|
适中
(0.65)
名校
【推荐1】设等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/16b4b14b289644abafc1a1b1c6bfedba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
A.18 | B.16 | C.14 | D.12 |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】设
为等差数列
的前n项和,且
,
,若
,则数列
的前30项和
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fcd86b9ed6819116a261629f96fae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e17b3a240d38a30f9575f447184cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a8941ed4a8a0b8829728939e0be0f9.png)
A.60 | B.30 | C.-60 | D.-30 |
您最近一年使用:0次