Forgot password?
 Register account
View 1774|Reply 2

[不等式] 一个不等式

[Copy link]

413

Threads

905

Posts

110K

Credits

Credits
10989

Show all posts

lemondian Posted 2018-1-4 16:12 |Read mode
已知a,b,c>0,$a^2+b^2+c^2=3$,求证:$\frac{a}{\sqrt{4-a^2}}+\frac{b}{\sqrt{4-b^2}}+\frac{c}{\sqrt{4-c^2}}\leqslant \sqrt{3}$

686

Threads

110K

Posts

910K

Credits

Credits
91229
QQ

Show all posts

kuing Posted 2018-1-4 17:36
哼,都不成立:$a=b=\sqrt{1/2}$, $c=\sqrt2$ 为反例。

413

Threads

905

Posts

110K

Credits

Credits
10989

Show all posts

 Author| lemondian Posted 2018-1-4 18:30
回复 2# kuing


   哦,真的,我是从网上看到的。SORRY

Mobile version|Discuz Math Forum

2025-5-31 11:20 GMT+8

Powered by Discuz!

× Quick Reply To Top Edit