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【2027届·高二·选择性必修2·课件PPT+Word】第四章 §4.2.1 第1课时 等差数列的概念及通项公式

  • 2026-08-24 21:04:57
【2027届·高二·选择性必修2·课件PPT+Word】第四章 §4.2.1 第1课时 等差数列的概念及通项公式

【高二 · 选择性必修2 · 课件PPT】

2026-2027学年高一·必修2（人教A版）课件系列
本文编号：26G2E2KJ003；资料获取方式见文末

【学习目标】

1.理解等差数列、等差中项的概念.
2.掌握等差数列的通项公式，并能运用通项公式解决一些简单的问题.(重点)
3.体会等差数列与一次函数的关系.(难点)4.掌握等差数列的判定与证明方法.(重难点)
【知识梳理】

一般地，如果一个数列从第2项起，每一项与它的前一项的差都等于同一个常数，那么这个数列就叫做等差数列，这个常数叫做等差数列的公差，公差通常用字母d表示.

【注意点】

(1)概念的符号表示：an+1-an=d(n∈N*)或an - an-1=d(n≥2，n∈N*).

(2)定义中强调“从第2项起”，因为第一项没有前一项.

(3)差必须是同一个常数.

(4)公差可以是正数、负数、零.

本文内容获取方式

1.本文编号：26G2E2KJ003， 售价5元，含有两个文件：①可编辑的PPT格式文件，②可编辑的Word版文件；

2.付款及获取文件方式点击文末左下方阅读原文.

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  1. CONNECT:[ UseTime:0.000892s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001474s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000644s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.069095s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001500s ]
  6. SELECT * FROM `set` [ RunTime:0.000660s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001622s ]
  8. SELECT * FROM `article` WHERE `id` = 527436 LIMIT 1 [ RunTime:0.011708s ]
  9. UPDATE `article` SET `lasttime` = 1787583563 WHERE `id` = 527436 [ RunTime:0.093617s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003456s ]
  11. SELECT * FROM `article` WHERE `id` < 527436 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.060653s ]
  12. SELECT * FROM `article` WHERE `id` > 527436 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.020376s ]
  13. SELECT * FROM `article` WHERE `id` < 527436 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014196s ]
  14. SELECT * FROM `article` WHERE `id` < 527436 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006203s ]
  15. SELECT * FROM `article` WHERE `id` < 527436 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006261s ]
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