当前位置:首页>复习资料>【2026版高考复习三维设计一轮课时培优讲义数学电子版第一节数列的概念与表示-208d0c48942b

【2026版高考复习三维设计一轮课时培优讲义数学电子版第一节数列的概念与表示-208d0c48942b

  • 2026-03-28 13:05:23
【2026版高考复习三维设计一轮课时培优讲义数学电子版第一节数列的概念与表示-208d0c48942b

课标要求

通过日常生活和数学中的实例,了解数列的概念和表示方法列表、图象、通项公式),了解数列是自变量为正整数的一类特殊函数.

1.数列的概念

概念

含义

数列

按照排列的一列数

数列的项

数列中的

数列的通项

数列{an}的第nan

通项公式

数列{an}的第nan之间的关系式

n项和

数列{an}中,Sn

提醒 数列的项是指数列中某一确定的数,而项数是指数列的项对应的位置序号.

2.数列的分类及性质

3.数列的表示方法

列表法

列出表格表示nan的对应关系

图象法

把点画在平面直角坐标系中

通项

公式

把数列的通项用表示

递推

公式

如果一个数列的相邻两项或多项之间的关系可以用一个式子来表示,那么这个式子叫做这个数列的递推公式

4.数列与函数的关系

数列{an}是从正整数集N*或它的有限子集{1,2,…,n}到实数集R的函数,其自变量是    ,对应的函数值是       ,记为anfn).

1.在数列{an}(n2中,若an最大,则an最小,则

2.ankank为非零常数),则数列{an}为周期数列,k{an}的一个周期.

3.若数列{an}的前n项和为Sn,通项公式为an,则an

1.判断正误.(正确的画”,错误的画“×”)

1相同的一组数按不同顺序排列时都表示同一个数列.(

21,1,1,1,…,不能构成一个数列.(

3任何一个数列都有唯一的通项公式.(

4如果数列{an}的前n项和为Sn,则对任意nN*,都有an1Sn1Sn.(

2.已知数列1,,-,-,…,则该数列的第100项为

A.10  B.-10  C.-11  D.

3.(A选二P8练习3题改编在数列{an}中,a11,an1n2),a5=(

A.B.

C.D.

4.已知数列{an}满足an3nkn,若{an}为递增数列,则实数k的取值范围是

A.(-2,+∞)B.(-6,+∞)

C.(-∞,-2D.(-∞,2

5.(A选二P8练习4题改编已知数列{an}的前n项和公式为Snn2,则an.

由数列的前几项归纳通项公式

师生共研过关

A选二P64改编如图,在n×n的单位正方形网格中,阴影相连的正方形个数依次为1,5,9,13,则下一阴影相连的正方形个数为   ,这个数列的一个通项公式an.

听课记录解题技法

由数列的前几项归纳通项公式应注意的4个特征

1分式中分子、分母的特征

2相邻项的变化特征

3拆项后的特征把数列的项拆分成变化的部分和不变的部分

4各项的符号特征.

 根据下面各数列前几项的值,写出数列的一个通项公式

1)-1,7,-13,19,…;

2)-,-,…;

3,…;

49,99,999,9 999,….

anSn的关系求an

师生共研过关

1)(2025·漳州一模已知数列{an}的前n项和为Sn,若3Snan1,则=(

A.-B.-

C.D.

2已知数列{an}满足a12a23a3+…+nan2n,则an.

听课记录解题技法

1.Snan关系问题的求解思路

根据所求结果的不同要求,将问题向两个不同的方向转化.

1利用anSnSn1n2转化为只含Sn,Sn1的关系式,再求解

2利用SnSn1ann2转化为只含an,an1的关系式,再求解.

2.已知Snan3个步骤

1先利用a1S1求出a1

2n1替换Sn中的n得到一个新的关系,利用anSnSn1n2即可求出当n2an的表达式

3注意检验n1时的表达式是否可以与n2时的表达式合并.

1.数列{an}的前n项和Sn2n3,则此数列的通项公式an.

2.(2025·湖北模拟设数列{an}满足a1+…+an.

数列的性质

定向精析突破

考向1数列的周期性

2025·淄博测试数列{an}满足a1n1nN*),a2 027=(

A.   B.3   C.-2   D.-

听课记录解题技法

解决数列周期性问题的方法

根据所给的关系式求出数列的若干项,通过观察归纳出数列的周期,进而求出有关项的值或者前n项的和.

通过网盘分享的文件:word讲义

链接: https://pan.baidu.com/s/1v0ZN4lcjlP-RO3TtjBE84w?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000604s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001014s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000361s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000756s ]
  6. SELECT * FROM `set` [ RunTime:0.000247s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000827s ]
  8. SELECT * FROM `article` WHERE `id` = 462985 LIMIT 1 [ RunTime:0.000587s ]
  9. UPDATE `article` SET `lasttime` = 1774758838 WHERE `id` = 462985 [ RunTime:0.002376s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000311s ]
  11. SELECT * FROM `article` WHERE `id` < 462985 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000559s ]
  12. SELECT * FROM `article` WHERE `id` > 462985 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000504s ]
  13. SELECT * FROM `article` WHERE `id` < 462985 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001259s ]
  14. SELECT * FROM `article` WHERE `id` < 462985 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001093s ]
  15. SELECT * FROM `article` WHERE `id` < 462985 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001571s ]
0.081855s