名校
解题方法
1 . 已知等差数列
的前n项和公式为
,
,
.
(1)求
的通项公式;
(2)若对
,
恒成立,求
的取值范围.
![](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/c06719d4729b0e4d1f3afc85e9a0681b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdf83d422af1c99c1f39aee133671fa.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b78297a65e7fad69635b19928ecc10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fa3d95d61db227598cab21e7c34a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2 . 已知数列
的前n项和为
,且
,
,则使得
成立的n的最小值为( )
![](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/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37f9ca46f9dccef6ee9eb142772ec64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa06f906c8f9b48407cc1c52f9629cc6.png)
A.32 | B.33 | C.44 | D.45 |
您最近一年使用:0次
2023-05-14更新
|
455次组卷
|
4卷引用:北京市第十二中学2022-2023学年高二下学期期中数学试题
北京市第十二中学2022-2023学年高二下学期期中数学试题广东省梅州市梅江区梅州中学2024届高三上学期第一次月考数学试题福建省福州市福清西山学校2024届高三上学期9月月考数学试题(已下线)专题05 数列 第三讲 数列与不等关系(解密讲义)
名校
解题方法
3 .
为等差数列
的前
项和,且
,公差不为零,若
成等比数列,求:
(1)数列
的通项公式及实数
的值;
(2)若数列
满足
,求数列
的前
项和
;
(3)若数列
满足
,求
的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c3b659c30c26d2e1e8af09ab9c786b.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/918da35b829ba65f36837507b548f862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab63769c936aebfc552aa5f3259d0a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330a90b55ebb8314745409bb260e6407.png)
您最近一年使用:0次
名校
解题方法
4 . 已知数列
的前n项和
满足
,
(1)求数列
的通项公式;
(2)求证:数列
等差数列;
(3)求数列
的前n项和
的最大值.
![](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/2e3ff3a72aff17978051c545b188386e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2023-09-30更新
|
1217次组卷
|
4卷引用:北京市第二外国语学院附属中学2022-2023学年高二上学期期中考试数学试题
北京市第二外国语学院附属中学2022-2023学年高二上学期期中考试数学试题黑龙江省大兴安岭实验中学(东校区)2024届高三上学期10月月考数学试题(已下线)专题4.2 等差数列(5个考点八大题型)(2)(已下线)4.2.2 等差数列的前n项和公式——课后作业(提升版)
5 . 在等差数列
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8eb9943240ceec3e75d53fdd9448ae.png)
(1)求
的通项公式;
(2)若
是公比为2的等比数列,
,求数列
的通项及前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8eb9943240ceec3e75d53fdd9448ae.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79768a4e3970a18741cee3fbd8bcbdad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418fdab37c50ccfed612f1038569e913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2023-05-05更新
|
557次组卷
|
3卷引用:北京市海淀区中央民族大学附属中学2022-2023学年高二下学期期中考试数学试题
名校
解题方法
6 . 图
是第七届国际数学教育大会的会徽图案,会徽的主体图案是由如图
所示的一连串直角三角形演化而成的,其中
,如果把图
中的直角三角形继续作下去,记
,
,
,
的长度构成的数列为
,则
=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/9353a7cd-4927-462f-a2c1-5b145b399bb4.png?resizew=323)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60733091d0925b590f9cab6be1f71694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4195334905e2f190f958dbf5951456f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76916c6ff302cf4fb4b6ace5bb3a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337d0dc1076cfdb02ffb40bf4dac0d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96c3c9e6b61facbe5bf15388d47c2fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/9353a7cd-4927-462f-a2c1-5b145b399bb4.png?resizew=323)
A.52 | B.![]() |
C.10 | D.100 |
您最近一年使用:0次
2023-04-18更新
|
308次组卷
|
2卷引用:北京市八一学校2024届高三上学期开学摸底考试数学试题
名校
解题方法
7 . 已知数列
为等差数列,其前n项和为
,
,
,若对于任意的
,总有
恒成立,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/9ff6bd0b129ecb5c0ecfb3190a269ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a0b86791fe2592e537ee383dc66160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a101b17ad11f85af2e004290bd7a9de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.6 | B.7 | C.9 | D.10 |
您最近一年使用:0次
2023-03-19更新
|
1431次组卷
|
6卷引用:北京市清华附中2023届高三统练二数学试题
北京市清华附中2023届高三统练二数学试题北京市第五中学2022-2023学年高二下学期期中考试数学试题(已下线)专题03等差数列与等比数列(已下线)专题11 押全国卷(理科)第4、8题 数列辽宁省沈阳市第二中学2022-2023学年高二下学期4月月考数学试题辽宁省重点高中沈阳市郊联体2023-2024学年高二下学期4月月考数学试卷
名校
解题方法
8 . 已知数列
中,
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e7f395f753da570e66cfcf3f5df752.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
A.![]() | B.12 | C.![]() | D.16 |
您最近一年使用:0次
名校
解题方法
9 . 1682年,英国天文学家哈雷发现一颗大彗星的运行曲线和1531年、1607年的彗星惊人地相似.他大胆断定,这是同一天体的三次出现,并预言它将于76年后再度回归.这就是著名的哈雷彗星,它的回归周期大约是76年.请你预测它在本世纪回归的年份( )
A.2042 | B.2062 | C.2082 | D.2092 |
您最近一年使用:0次
2023-02-17更新
|
867次组卷
|
5卷引用:北京市八一学校2023届高三下学期3月月考数学试题
名校
解题方法
10 . 已知数列
满足
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2f03f58e3c85de45bd3fd86a8a66f7.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713e2240490b94239f64318b6eb6751b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2f03f58e3c85de45bd3fd86a8a66f7.png)
您最近一年使用:0次