1 . 定义:
是无穷数列,若存在正整数k使得对任意
,均有
则称
是近似递增(减)数列,其中k叫近似递增(减)数列
的间隔数
(1)若
,
是不是近似递增数列,并说明理由
(2)已知数列
的通项公式为
,其前n项的和为
,若2是近似递增数列
的间隔数,求a的取值范围:
(3)已知
,证明
是近似递减数列,并且4是它的最小间隔数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5868622de607b54d53fc6c481dc6302d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd6e7277f682a7f7adf2243ac5c9e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b2c4b8c1ebc9a3622f7d09de41496f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73841553d9289a6463664c8ea4647127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2020-05-19更新
|
398次组卷
|
4卷引用:上海市文建中学2022-2023学年高一上学期期中数学试题
上海市文建中学2022-2023学年高一上学期期中数学试题2020届上海市宝山区高三下学期二模数学试题(已下线)上海市华东师范大学第二附属中学2019-2020学年高一下学期期末数学试题上海市七宝中学2022届高三上学期十月月考数学试题
解题方法
2 . 已知各项均为正数的数列
的前n项和为
,
.
(1)求数列
的通项公式;
(2)记
,若集合
中恰好有3个元素,求实数
的取值范围;
(3)若
,且
,求证:数列
为等差数列.
![](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/a0b3a5d7c4b2c22c0a52913e040ffb21.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbd6eb6f6025182bbd1f716797d8b59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f3408ebc44f3de88f8092ce35293fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0838ccd8e23f5e9c7d4cff263e7866eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0133bfe837cd9d41f2d06d81a59f179d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
您最近一年使用:0次
解题方法
3 . 若数列
对任意连续三项
,均有
,则称该数列为“跳跃数列”.
(1)判断下列两个数列是否是跳跃数列:
①等差数列:
;
②等比数列:
;
(2)若数列
满足对任何正整数
,均有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc47df306e4bc72632047fbe01619bf9.png)
.证明:数列
是跳跃数列的充分必要条件是
.
(3)跳跃数列
满足对任意正整数
均有
,求首项
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4993aaab02cbc3cbed15d025f4b4e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dc2d44dfdb07c42acfb6eb6eec1f69.png)
(1)判断下列两个数列是否是跳跃数列:
①等差数列:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc28deef24c776e671639e6cfc028fa.png)
②等比数列:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9819764e7f56202270fd85e6841c9.png)
(2)若数列
![](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/bc47df306e4bc72632047fbe01619bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff03fcfa701aa0f42e914bd82afaaeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1381f0937c6052ce088e0eaee7df4880.png)
(3)跳跃数列
![](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/2ae8a1b864e3e6d37a0eb027e661d9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
名校
4 . 设
是等差数列,且公差不为零,其前
项和为
.则“
,
”是“
为递增数列”的( )
![](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/cac657ea5bbf4b237a30e4074c76cc81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef64850887c5c8cad4d574b0b09307a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
2020-04-16更新
|
3022次组卷
|
16卷引用:上海市建平中学2023届高三上学期期中数学试题
上海市建平中学2023届高三上学期期中数学试题北京市房山区良乡中学2023届高三上学期期中数学试题2020届北京市高考适应性测试数学试题西藏拉萨市2020届高三第二次模拟考试数学(理)试题西藏拉萨市2020届高三第二次模拟考试数学(文)试题河南省信阳市2019-2020学年高二下学期期末数学(文科)试题(已下线)专题09 常用逻辑用语-2020年高考数学母题题源解密(北京专版)(已下线)第20练 数列的概念及其表示-2021年高考数学(文)一轮复习小题必刷北京市第十三中学2021届高三上学期期中考试数学试题人教A版(2019) 选择性必修第二册 过关斩将 第四章 数列 本章达标检测北京市第四十三中学2021届高三1月月考数学试题西藏昌都市第一高级中学2021届高三下学期入学考试数学(文)试题福建省福州第三中学2021届高三上学期第二次质量检测数学试题(已下线)8.1 等差数列(已下线)8.4 数列专项训练北京市北京师范大学附属实验中学2023-2024学年高二下学期期中考试数学试卷
名校
解题方法
5 . 已知数列
的前
项和为
,且满足
,
,设
,
.
(Ⅰ)求证:数列
是等比数列;
(Ⅱ)若
,
,求实数
的最小值;
(Ⅲ)当
时,给出一个新数列
,其中
,设这个新数列的前
项和为
,若
可以写成
(
,
且
,
)的形式,则称
为“指数型和”.问
中的项是否存在“指数型和”,若存在,求出所有“指数型和”;若不存在,请说明理由.
![](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/22afec8bdc08ff937a2f386d95e9f1bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad47c46bcf213c73471655c08c53e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b73fd5c8507824f28ee1569ae5fad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(Ⅰ)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb71aacea5a3e019c3d081428834f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅲ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c340d7d093dd4a275ffea4b87cd26827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d4dea64b7e8e597c1601d4340c7f2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b98432c54bd7df6e5e6a425f9ec04218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6a22128f7e9de6fb6c0edf38c3d2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544530e1133b2924ccfbe691141a5641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dab9e79198239cda875305fd6809b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ef8539a7a09303a95b4e79fb9949fc.png)
您最近一年使用:0次
2020-03-24更新
|
1264次组卷
|
6卷引用:上海市2022届高三模拟(三)数学试题
上海市2022届高三模拟(三)数学试题上海市浦东新区建平中学2019-2020学年高三下学期(4月)模拟数学试题2020届上海市高三高考压轴卷数学试题2015届北京市东城区高三5月综合练习二理科数学试卷北京市陈经纶中学2019-2020学年第一学期高二数学期中试题(已下线)专题10 数列通项公式的求法 微点1 观察法(不完全归纳法)、公式法
6 . 设数列
满足
,其中A,B是两个确定的实数,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d52399e72456de84f0a42dd69da06fb.png)
(1)若
,求
的前n项和;
(2)证明:
不是等比数列;
(3)若
,数列
中除去开始的两项外,是否还有相等的两项,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5aec5ca778278faac23cf715117bc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d52399e72456de84f0a42dd69da06fb.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1dbc265ee707f10417714cfaa8c373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b2fb1017d5dfe3a300de3e14a71b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2020-02-03更新
|
257次组卷
|
3卷引用:上海市复旦大学附属中学2022届高三下学期开学考试数学试题
7 . 已知函数
(
为常数,
且
),且数列
是首项为
,公差为
的等差数列.
(1)求证:数列
是等比数列;
(2)若
,当
时,求数列
的前
项和
的最小值;
(3)若
,问是否存在实数
,使得
是递增数列?若存在,求出
的范围;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6197dc50df6f4555df9546c02c93d7ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a40acc6989a5ea23c7b067f62cb29ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f37c589447bba4e81b0fa9b7cd15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c8e7f5b61b2249f96161dbd5ce4ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286b932a3c77ae8d01ad34100ba7becd.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/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3b2e146f0407a3353d9d1570ed214d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
名校
8 . 设数列
满足
,
,
.
(1)求证:数列
为等比数列;
(2)对于大于
的正整数
、
(其中
),若
、
、
三个数经适当排序后能构成等差数列,求符合条件的数组
;
(3)若数列
满足
,是否存在实数
,使得数列
是单调递增数列?若存在,求出
的取值范围;若不存在,说明理由.
![](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/a7e1283865fa0ec060f5aacfb36d3958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665b46731a547bda2e0b2000ac398b10.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)对于大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edfabf4c1120b945b6344f60fab63c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7bd080401c9d37a3bde2d292e5ffe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cf58a39b00433d2ffbf34e86ca2f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb154d379cea257b00f0df1342d91f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c7068c999c23b741a3bb15eb0c9e21.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8ce1af5aad022b3ffa68c36f38f257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2020-01-20更新
|
240次组卷
|
3卷引用:考向18 数列不等式-备战2022年高考数学一轮复习考点微专题(上海专用)
9 . 已知等差数列
的公差
,
表示
的前
项和,若数列
是递增数列,则
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f2572192cc7ca046e9a3155ef3e56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2020-01-13更新
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3卷引用:上海市吴淞中学2022-2023学年高二上学期第二次月考数学试题
名校
10 . 设
为正整数,各项均为正整数的数列
定义如下:
,
(1)若
,写出
,
,
;
(2)求证:数列
单调递增的充要条件是
为偶数;
(3)若
为奇数,是否存在
满足
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c711c10f22bfbcc9e1b961020a06d41.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7a1d739890a8951586e23b78b035bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15ffa7fecea3704dc892ea8cd513c59.png)
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2020-01-12更新
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4卷引用:上海市2022届高三模拟卷(一)数学试题