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Can you completed your proof for my problem?Thanks.

I thinks you idea is not true. We must find f(x) from its condition.

Oh. I have find

Please pose your proof?

**Thanh Vân**- Replies: 8

Find the function

such that

Look my inequality, you can see Maximun of left Inequality is when a=b=c=3 and minimum right inequality is same as yourself.

But it is very easy to talk so.

I thinks it is a problem very very nice, and we can solve it by basic 's inequality.

Maybe it is CS and AM-GM.

**Thanh Vân**- Replies: 5

Let a,b,c be real numbers in [1;3]. prove that

Oh. Hi gAr. I don't understand your proof.

Why you have

**Thanh Vân**- Replies: 6

Let a,b,c,d be positive real numbes. prove that

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