1 . 将正整数
分解为两个正整数
、
的积,即
,当
、
两数差的绝对值最小时,我们称其为最优分解.如
,其中
即为20的最优分解,当
、
是
的最优分解时,定义
,则数列
的前2024项的和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baf9e95e555b69df69a2bbc2ed86244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0337976ed56157fdfdb4ad0d5083f87a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355bc0d6058a3dd1254ff395176ec55b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a46ca6d6012da9e32aacb4103129f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17236c6316d598e9804f5eab3cbef9f7.png)
您最近一年使用:0次
名校
解题方法
2 . 已知数列
的各项均不为零,
,它的前n项和为
.且
,
,
(
)成等比数列,记
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fab51121848ce166035ceab6f4e00b.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/1b0cfe24f4698eaed9c426b24b4c9f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c02dbb997821402b1be65ca34c3ee.png)
A.当![]() ![]() | B.当![]() ![]() |
C.当![]() ![]() | D.当![]() ![]() |
您最近一年使用:0次
2021-11-11更新
|
1526次组卷
|
6卷引用:上海市南洋模范中学2021-2022学年高二上学期12月月考数学试题
上海市南洋模范中学2021-2022学年高二上学期12月月考数学试题(已下线)第4章 数列 单元综合检测(难点)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)浙江省金华十校2021-2022学年高三上学期11月月考数学试题(已下线)2021年新高考浙江数学高考真题变式题6-10题(已下线)考点25 数列求和及其运用-备战2022年高考数学典型试题解读与变式(已下线)收官卷--备战2022年高考数学一轮复习收官卷(浙江专用)
名校
解题方法
3 . 若数列
的前
项和为
,且满足等式
.
(1)求数列
的通项公式;
(2)能否在数列
中找到这样的三项,它们按原来的顺序构成等差数列?说明理由;
(3)令
,记函数
的图像在
轴上截得的线段长为
,设
,求
,并证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/345307b291e338fbbd2bc86a39f53164.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)能否在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(3)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771991b0812e4ee2d678982c5461b86d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c9752056ebb05a8e4eee608c34046b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82433897679bbf03dab49684cbfec2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5bb9e8d8cd3f0a8c7f1c3f239bd351.png)
您最近一年使用:0次
2021-10-18更新
|
1381次组卷
|
10卷引用:上海市大同中学2021-2022学年高二上学期10月月考数学试题
上海市大同中学2021-2022学年高二上学期10月月考数学试题上海市松江一中2021-2022学年高二上学期期末数学试题(已下线)上海高二下学期期末真题精选(压轴60题35个考点专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)上海市嘉定区第一中学2023-2024学年高二上学期期中数学试题(已下线)期末真题必刷压轴60题(22个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)新疆维吾尔自治区喀什第六中学2023届高三上学期9月实用性月考(一)数学(文)试题新疆维吾尔自治区喀什第六中学2023届高三上学期9月实用性月考(一)数学(理)试题(已下线)广东省2022届高三一模数学试题变式题17-22(已下线)专题11 数列前n项和的求法 微点5 裂项相消法求和(三)(已下线)专题15 数列不等式的证明 微点3 通项放缩法证明数列不等式
名校
解题方法
4 . 数列
满足
,其前
项和为
,若
成立,则
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e8e37b47c46df284f6153cf942ff9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb6a7a09db089453c8fa58f1db9c4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.8 | B.9 | C.10 | D.11 |
您最近一年使用:0次
2020-05-08更新
|
727次组卷
|
2卷引用:上海市华东师范大学第三附属中学2021-2022学年高二下学期3月月考数学试题
名校
5 . 设数列
的前
项和
,已知
,
.
(1)求证:数列
为等差数列,并求出其通项公式;
(2)设
,又
对一切
恒成立,求实数
的取值范围;
(3)已知
为正整数且
,数列
共有
项,设
,又
,求
的所有可能取值.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85955f51864a2ef4adf786e9d192af1.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a813139b92a24e1124ef96e3e485f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7368d871d7a543a82be0758f3ba904d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/effd163f8b1a235eb67227956e3652e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f8740053b8bcc7c8b4a129436f52d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2019-11-08更新
|
426次组卷
|
4卷引用:上海市嘉定二中2019-2020学年高二上学期10月月考数学试题
6 . 设数列
是等差数列,且公差为d,若数列
中任意(不同)两项之和仍是该数列中的一项,则称该数列是“封闭数列”.
(1)若
,求证:该数列是“封闭数列”;
(2)试判断数列
是否是“封闭数列”,为什么?
(3)设
是数列
的前n项和,若公差
,试问:是否存在这样的“封闭数列”,使
;若存在,求
的通项公式,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71661efbd38645dd04a5c93ed6bc32c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f069c238e1d9239fd3913b228965460f.png)
(2)试判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3770337011cf6ee188d3dac48303bed6.png)
(3)设
![](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/50c81d6206a09006901987c51d7532cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54d6777bfac3060e53da2ff964e5b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2019-11-06更新
|
232次组卷
|
2卷引用:上海市晋元高级中学2019-2020年高二上学期9月阶段反馈数学试题
2014·上海徐汇·一模
名校
解题方法
7 . 一个三角形数表按如下方式构成(如图:其中项数
):第一行是以4为首项,4为公差的等差数列,从第二行起,每一个数是其肩上两个数的和,例如:
;
为数表中第
行的第
个数.
…
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f95aaf633b692769df70ead32d09b.png)
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f3141c9a3543d080052159918cb7d7.png)
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f3b1c2ecda47422b4807489d3efabf.png)
……
(1)求第2行和第3行的通项公式
和
;
(2)证明:数表中除最后2行外每一行的数都依次成等差数列,并求
关于
的表达式;
(3)若
,
,试求一个等比数列
,使得
,且对于任意的
,均存在实数
,当
时,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5d0a73f50b3e4583f1c1b6d6bf0d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ff64e5f0e9058bf4358024dfeeaa23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ac67868774922bd551bd3a921919e9.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/b433ad3f880bd4b12f8ec04b733235e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c96813e6e4d6c93cf171bc354eb0618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74af3720f59ce4f2d00a8e798d297c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f95aaf633b692769df70ead32d09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b52d0d1757ca7af6b4e75dcc8edc3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ccaeb381a7f4062c8a70541ed95b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f3141c9a3543d080052159918cb7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8d153808e059cced1f34cd37b82f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f3b1c2ecda47422b4807489d3efabf.png)
……
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66264366bbcab975022cffa711236f18.png)
(1)求第2行和第3行的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2295a385504d809c311ff4bb3f980bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619cef116e3f701de6707ec0b4dc728a.png)
(2)证明:数表中除最后2行外每一行的数都依次成等差数列,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf50e032946010d31c6288135eb4303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b640c28d4f3afbf94d07ec2e4d98b06.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b319dbcf9f7afc9a20ab83e312a5e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a92d4463e0a56109a13d60b640e0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52fc0fe9024f5a2abc30f67eeff626b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15bb6414a399db20565393afa52091a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46708de4fb77ee69d2a5453de0cefa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe9dbc75f393b682c8a90fe7277ab4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afaaa196735c0c02f05f97fda5534a4.png)
您最近一年使用:0次
2019-04-14更新
|
524次组卷
|
5卷引用:上海市七宝中学2020-2021学年高二上学期10月月考数学试题
上海市七宝中学2020-2021学年高二上学期10月月考数学试题上海市南洋模范中学2019届高三下学期3月月考数学试题四川省成都市教育科学研究院附属中学2023-2024学年高二下学期3月月考数学试题(已下线)2014届上海市徐汇、金山、松江区高三下学期学习能力诊断理数学试卷2016届上海市南洋模范中学高三5月三模数学试题