Forgot password
 Register account
View 1708|Reply 5

[函数] 漂移题吗?

[Copy link]

209

Threads

949

Posts

2

Reputation

Show all posts

敬畏数学 posted 2019-9-23 08:36 |Read mode
$f(x)=x-\frac{1}{2}\sin x-\frac{m}2\ln x+1$,存在$s,t∈(0,+\infty),s≠t,$ 满足$f(s)=f(t)$, 证明:$st<m^2$

107

Threads

224

Posts

1

Reputation

Show all posts

facebooker posted 2019-9-23 11:37
Last edited by facebooker 2019-9-23 13:09回复 1# 敬畏数学

是的 标准的漂移题 ALG带入就行了 但是需要先考察$g(x)=x-\sin x$的单调性 把$\sin x$放缩掉

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2019-9-23 12:34
forum.php?mod=viewthread&tid=6564(没解答,只是想对比一下代码与效果……

0

Threads

1

Posts

0

Reputation

Show all posts

吕玉波 posted 2019-9-29 07:46
sinx用x换了  飘移吧   最近武汉的题目吧

209

Threads

949

Posts

2

Reputation

Show all posts

original poster 敬畏数学 posted 2019-9-29 09:36
回复 2# facebooker

209

Threads

949

Posts

2

Reputation

Show all posts

original poster 敬畏数学 posted 2019-9-29 09:37
[b]回复 4# 吕玉波 [
  

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 14:14 GMT+8

Powered by Discuz!

Processed in 0.011834 seconds, 23 queries