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O teto retangular de um depósito mede 12 \text{ m} por 18 \text{ m}, e é coberto por quadrados de telhas acústicas que têm 1 \text{ m} de lado. Cada telha pesa \frac{1}{4} \text{ kg}. Qual será o peso total de telhas necessário para cobrir o teto?

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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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