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[obm-l] Desigualdades
- To: obm-l@xxxxxxxxxxxxxx
- Subject: [obm-l] Desigualdades
- From: Klaus Ferraz <klausferraz@xxxxxxxxxxxx>
- Date: Mon, 6 Feb 2006 23:24:42 +0000 (GMT)
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Prove que se a,b e c sao lados de um triangulo, entao a/(b+c) + b/(a+c)+c/(a+b)<3/2
Determine todos os x e y reais tais que 20x^2+10y^2+4xy+12x-10y+5=0
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