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Problema: Resolva a equação \\frac{1}{x} + \\frac{1}{y} = \\frac{1}{3} sabendo que x e y são inteiros positivos.

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57. (UFRGS-RS) Na promoção de um produto cujo custo unitário é de R$ 5,75 se lê: \"Leve 3, pague 2\". Usando as condições da promoção, a economia máxima que poderá ser feita na compra de 188 itens deste produto é:

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