Forgot password
 Register account
View 2319|Reply 6

[数列] 转解题群数列问题

[Copy link]

412

Threads

1432

Posts

3

Reputation

Show all posts

realnumber posted 2014-2-28 14:55 |Read mode
似乎不好解, QQ图片20140227085051-----=.jpg

四川--龚旻(36------2)  14:44:48

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2014-2-28 14:57
回复 1# realnumber

反过来不就好了,设 $a_n=-3$,求 $a_1$ 的通项。
也就是将递推式反解出 $a_n$,然后还是不动点求通项。

412

Threads

1432

Posts

3

Reputation

Show all posts

original poster realnumber posted 2014-2-28 14:57
重庆杨---(37-----07)  14:55:12
a1=5-8/k,k为整数
这些a1都满足

a1有无穷多个取值
----估计是这个了,没兴趣想了.

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2014-2-28 15:03
回复 3# realnumber

k 的范围估计还要确定一下

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2014-2-28 15:20
这类题其实也很旧了,以前解过的一道:bbs.pep.com.cn/thread-535965-1-1.html

412

Threads

1432

Posts

3

Reputation

Show all posts

original poster realnumber posted 2014-2-28 17:43
这样啊

84

Threads

2340

Posts

4

Reputation

Show all posts

其妙 posted 2014-2-28 21:52
QQ图片20131210163108.jpg
妙不可言,不明其妙,不着一字,各释其妙!

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

2025-7-22 08:21 GMT+8

Powered by Discuz!

Processed in 0.054641 seconds, 25 queries