数列
的前n项和为
,且
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d7a7c772969095b56240fdb725abf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27182444d3da4003680f07ec299087c.png)
A.35 | B.48 | C.![]() | D.93 |
更新时间:2024-05-18 18:17:02
|
相似题推荐
单选题
|
较易
(0.85)
名校
解题方法
【推荐1】设
是数列
的前
项和,已知
则数列
( )
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a6534562db0c83b633f37065e56bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.是等比数列,但不是等差数列 |
B.是等差数列,但不是等比数列 |
C.是等比数列,也是等差数列 |
D.既不是等差数列,也不是等比数列 |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
解题方法
【推荐2】数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a4d55fe5def2864a4eafdc5b64f41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78d551e6cc415f570dc7fc49b825cb1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
名校
解题方法
【推荐1】各项均为正数的等比数列
中,
成等差数列,
是
的前
项和,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cab22ca4b959ba42ec569bb5c871bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe27907ac9f9e286ddd5a9dcd52c222.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/46d1be57042d682dbe2947cf087ff1cb.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次