等差数列
中,
,那么
的值是
![](https://img.xkw.com/dksih/QBM/2012/3/23/1570819757383680/1570819762462720/STEM/d1f390f9136b4f1c93ba71299cfd1d6e.png)
![](https://img.xkw.com/dksih/QBM/2012/3/23/1570819757383680/1570819762462720/STEM/d0d34e17cc3f46848374d4dc8c49fb61.png)
![](https://img.xkw.com/dksih/QBM/2012/3/23/1570819757383680/1570819762462720/STEM/8c198cde70814aef8bbe9aaa01ab03a4.png)
A.12 | B.24 | C.36 | D.48 |
9-10高一下·黑龙江·期中 查看更多[1]
(已下线)2010年黑龙江省哈六中高一下学期期中考试数学试题
更新时间:2016-11-30 05:02:02
|
【知识点】 求等差数列前n项和
相似题推荐
单选题
|
较易
(0.85)
【推荐1】已知等比数列
的前
项的乘积记为
,若
,则
的最大值为
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ecfb04b5f5f9d6eaa24742826e2eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】已知等差数列
的前n项和为
,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/bb43db506a15a5066bcc9ed5b25509b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
A.7 | B.14 | C.21 | D.42 |
您最近一年使用:0次