Forgot password
 Register account
View 1698|Reply 4

[数列] 数列通项公式

[Copy link]

12

Threads

34

Posts

0

Reputation

Show all posts

xianjian posted 2017-4-17 16:45 |Read mode
16.png

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2017-4-17 17:01
\begin{gather*}
2a_{n}=(n+1)(-1+a_{n+1}-a_{n}) \\
a_{n+1}=\frac{n+3}{n+1}a_{n}+1 \\
\frac{a_{n+1}}{(n+3)(n+2)}=\frac{a_{n}}{(n+2)(n+1)}+\frac{1}{(n+3)(n+2)} \\
\frac{a_{n+1}}{(n+3)(n+2)}+\frac{1}{n+3}=\frac{a_{n}}{(n+2)(n+1)}+\frac{1}{n+2}
\end{gather*}

12

Threads

34

Posts

0

Reputation

Show all posts

original poster xianjian posted 2017-4-17 18:19
谢谢kuing,谢谢!!!

12

Threads

34

Posts

0

Reputation

Show all posts

original poster xianjian posted 2017-4-17 18:37
回复 2# kuing

新课标卷最近这几年数列考得都不难,主要考查基本知识、技能的运用,在复习备考中大多只是注重基本的东西。
请教kuing老师,像这种题目涉及的变化技能需要加强嘛?谢谢!
这题是云南省二统的题目。

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2017-4-17 19:29
回复 4# xianjian

又要强调:我不是老师。
我只思考题目怎么解怎么写,其余不理。

Quick Reply

Advanced Mode
B Color Image Link Quote Code Smilies
You have to log in before you can reply Login | Register account

$\LaTeX$ formula tutorial

Mobile version

2025-7-15 14:50 GMT+8

Powered by Discuz!

Processed in 0.014918 seconds, 25 queries