在等差数列
中,
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7558f50485e798a8feae6186ed406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02271c7d1cc1cc2e002193f37ad15fd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.3 | B.6 | C.9 | D.12 |
更新时间:2019-03-13 10:21:23
|
【知识点】 利用等差数列的性质计算
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
中,若
,则此数列的前13项的和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07404ab51f404f9411f79bd4f1fde654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df8ba47fc33f0c3b64e4411a8d709f1.png)
A.8 | B.9 | C.13 | D.12 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】公差不为零的等差数列
的前
项和为
,若
是
与
的等比中项,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5cc09a66cb35ef1ee5fce4dd3da8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次