Forgot password
 Register account
View 1619|Reply 4

[不等式] 证明:$a^ab^b\geqslant(ab)^{(a+b)/2}$,其中 $a,b>0.$

[Copy link]

81

Threads

165

Posts

1

Reputation

Show all posts

APPSYZY posted 2020-5-31 03:05 |Read mode
证明:$a^ab^b\geqslant(ab)^{(a+b)/2}$,其中 $a,b>0.$

81

Threads

165

Posts

1

Reputation

Show all posts

original poster APPSYZY posted 2020-5-31 03:06
应该可以从函数$y=x\ln x$的凹凸性出发?

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2020-5-31 04:46
你想多了吧……不就是 `(a/b)^{a-b}\geqslant0` 吗……

3200

Threads

7827

Posts

52

Reputation

Show all posts

hbghlyj posted 2020-5-31 10:41
你想多了吧……不就是 $(a/b)^{a-b}\geqslant0$ 吗……
kuing 发表于 2020-5-31 04:46
$(a/b)^{a-b}\geqslant1$

13

Threads

898

Posts

8

Reputation

Show all posts

色k posted 2020-5-31 10:47
回复 4# hbghlyj

哈!我困到手误了

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 14:26 GMT+8

Powered by Discuz!

Processed in 0.013123 seconds, 22 queries