1 . 设等比数列
的前n项和为
,公比
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7e42fdbf9d514ec90bc0a0bd6499a9.png)
![](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/2f5b78d8869e45eb2baf7422155a0992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7e42fdbf9d514ec90bc0a0bd6499a9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-08-02更新
|
269次组卷
|
2卷引用:云南省红河州2018-2019学年高二下学期期末试卷理科数学试题
解题方法
2 . 已知数列
的前
项和为
,且
,
,
成等差数列,则
( )
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5d2c6282df9bd122ad3b2830cfb40c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-04-11更新
|
1128次组卷
|
2卷引用:云南省昆明市2017届高三下学期第二次统测数学(理)试题
名校
3 . 已知数列
的前n项和为
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868b591bbf34859bf491022407a44f30.png)
![](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/868b591bbf34859bf491022407a44f30.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-04-25更新
|
455次组卷
|
5卷引用:云南省建水第六中学2017-2018学年高二下学期期中考试数学(理)试题
4 . 如图给出一个“三角形数阵”,已知每一列的数成等差数列,从第三行起,每一行的数成等比数列,每一行的公比都相等,记第
行第
列的数为
(
,
),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d2bcd8e9ed798c176e22bda7f25198.png)
![](https://img.xkw.com/dksih/QBM/2016/5/30/1572657322524672/1572657328316416/STEM/14593f3bdd8d4fd89048f63eb82a44fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c5607de1bdc7fb1df57f43601c6139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d2bcd8e9ed798c176e22bda7f25198.png)
![](https://img.xkw.com/dksih/QBM/2016/5/30/1572657322524672/1572657328316416/STEM/14593f3bdd8d4fd89048f63eb82a44fd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
5 . 设等比数列{an}的公比q=2,前n项和为Sn,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535cc0ae7869a42fbc58d12c02093f51.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 正项数列
是等比数列,公比为q,且
,则实数q为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe4d6c1e71a01dcd51194585d3b9a52.png)
A.![]() | B.1 | C.2 | D.![]() ![]() |
您最近一年使用:0次