1 . 等差数列
,0,
,…的第20项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071ff10740d0ef09e9b6ab0bf8a92283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 在等差数列
中,前n项和为
,已知
,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/4a9f10d564645a64a30387a0cdc5b06f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef354e5c5ff828cc8d27c71badd40f98.png)
A.5 | B.11 | C.8 | D.9 |
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名校
解题方法
3 . 已知数列
的首项为
,且满足
,其中
为其前
项和,若恒有
,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b658a4d3a1c0011f181cdf56c9212f.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/393c476f33c9fdf85d5e23245f6e97a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
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2023-10-06更新
|
859次组卷
|
5卷引用:河南省济源市济源第一中学2024届高三上学期期中数学试题
名校
4 . 已知等比数列
的前n项和为
,若
,且公比为3,则
与
的关系正确的是( )
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
5 . 等比数列
为递减数列,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b29c0f0c419dccea07ffcd5a0b286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5a96e8abfc1093f77263d576ef2c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e766f9c95aefa4ecee47c33e0bbb2a.png)
A.![]() | B.![]() | C.![]() | D.6 |
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2023-05-18更新
|
1008次组卷
|
7卷引用:河南省省直辖县级行政单位济源市2022-2023学年高二上学期期末数学理科试题
6 . 已知数列
的通项公式为
,则数列
的前2021项和等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b43e27090c9e7942f63caf19a7d6914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
7 . 在各项均为正数的等比数列
中,若
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75399f4000f530faea28e078c118811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3428a0b8cbc44a31880e0a2806f7245.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-12-07更新
|
821次组卷
|
5卷引用:河南省济源市第六中学2022-2023学年高二上学期期末考试数学试卷
河南省济源市第六中学2022-2023学年高二上学期期末考试数学试卷山东省滨州市沾化区实验高级中学2022-2023学年高二上学期第二次月考数学试题(已下线)4.3.1 等比数列的概念(第1课时)(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)广西桂林市第五中学2022-2023学年高二下学期期中考试数学试题(已下线)期末精确押题之单选题(45题)-2023-2024学年高二数学上学期《考点·题型·难点》期末高效复习(人教A版2019)
名校
8 . 数列
,
,
,
,…的一个通项公式是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459c84c9addfbd1cdd0a877ba7c584e4.png)
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2022-04-08更新
|
435次组卷
|
3卷引用:河南省济源市第四中学2023-2024学年高二上学期12月考数学试卷
名校
9 . 观察下列各式:
,
,则
的个位数字是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff880f110c3e29af021cd2e1b315d4dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f57e2cd2e0246745ecbcc95fdee17f.png)
A.3 | B.9 | C.7 | D.1 |
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2022-04-02更新
|
299次组卷
|
5卷引用:河南省济源市2021-2022学年高二下学期期末教学质量调研模拟试题(三)数学(文)试题
解题方法
10 . 设
为数列
的前n项和,满足
,
,数列
的前n项和为
,满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33ffdddd0b530062f8c0eedbb91cfa.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc8f3e6ffd1d667e4ff506915ad4a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303cecb7caf65df62667fb1f317c5843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33ffdddd0b530062f8c0eedbb91cfa.png)
您最近一年使用:0次