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> Interno Takmicenje, Rezultati

m_r
post Mar 24 2008, 06:34 PM
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Evo rezultata internog takmicenja za 1. razred.

Da podsetim da je interno takmicenje za 3-4. razred u utorak od 10.

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Wolfbrother
post Mar 24 2008, 08:49 PM
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Iz
 a+b+c \geq \frac{1}{a}+\frac{1}{b}+\frac{1}{c}
Sledi  \frac{a+b+c}{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}}\geq 1

E sad homogenizujemo nejednakost koju dokazujemo pa treba da dokazemo:

 \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \geq \frac{3}{a+b+c} + 2\frac{a+b+c}{abc(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})}

Cauchy-jem  \frac{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}}{3}\geq \frac{3}{a+b+c}

Sada jos treba dokazati:  \frac{2(\frac{1}{a}+\frac{1}{b}+\frac{1}{c})}{3}\geq \frac{2(a+b+c)}{ab+bc+ac}
Sto je ekvivalentno:
 \frac{ab}{c}+\frac{ac}{b}+\frac{bc}{a}\geq a+b+c
To se izmnozi i trivijalno Mjurhedom.

Valja li? Koji je taj seljacki nacin?

This post has been edited by Wolfbrother: Mar 24 2008, 08:50 PM


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Posts in this topic
m_r   Interno Takmicenje   Mar 24 2008, 06:34 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 24 2008, 07:48 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 24 2008, 08:16 PM
Wolfbrother   RE: Interno Takmicenje   Mar 24 2008, 08:18 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 24 2008, 08:18 PM
Wolfbrother   RE: Interno Takmicenje   Mar 24 2008, 08:34 PM
Wolfbrother   RE: Interno Takmicenje   Mar 24 2008, 08:49 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 24 2008, 09:00 PM
Wolfbrother   RE: Interno Takmicenje   Mar 24 2008, 09:04 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 24 2008, 09:11 PM
SerGrimReaper   RE: Interno Takmicenje   Mar 25 2008, 12:21 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 25 2008, 01:01 PM
Hannibal Lecter   RE: Interno Takmicenje   Mar 25 2008, 02:13 PM
^_NiN0_^   RE: Interno Takmicenje   Mar 25 2008, 02:40 PM
Cekaaa   RE: Interno Takmicenje   Mar 25 2008, 03:03 PM
^_NiN0_^   RE: Interno Takmicenje   Mar 25 2008, 03:20 PM
Cekaaa   RE: Interno Takmicenje   Mar 25 2008, 05:05 PM
^_NiN0_^   RE: Interno Takmicenje   Mar 25 2008, 05:21 PM


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