[obm-l] Numeros reais

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Subject: [obm-l] Numeros reais
From: Klaus Ferraz <klausferraz@xxxxxxxxxxxx>
Date: Thu, 2 Mar 2006 23:43:02 +0000 (GMT)
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Se a,b,c e d sao numeros inteiros positivos tais que (a+b)^2+a+3b=(c+d)^2+c+3d, prove que a=c e b=d.

Prove que a<>0 e b<>0 entao sqrt(a^2+b^2)>sqrt(a^3+b^3)

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