式子
的结果为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255ee5c51fde0e1ba8f7e86f86bba161.png)
A.![]() | B.![]() | C.![]() | D.以上都不对 |
更新时间:2020-03-14 11:17:51
|
【知识点】 求等比数列前n项和
相似题推荐
单选题
|
较易
(0.85)
名校
解题方法
【推荐1】已知
是各项均为正的等比数列,
是它的前
项和,若
,且
与
的等差中项为
,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/8569915a8c010b9ee6ace39ca9fc925a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358039a7c6e0004bc430d4ee2d89fe1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
解题方法
【推荐2】如图,作一个边长为
的正方形,再将各边的中点相连作第二个正方形,依此类推,共作了
个正方形,设这
个正方形的面积之和为
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/d1a824a1-353a-4233-bb51-4ade24591ded.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/ae9ad4e59d7081cf19021423a984bc29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/d1a824a1-353a-4233-bb51-4ade24591ded.png?resizew=128)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次