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Problema: Determine todos os valores de x que satisfazem a equação \text{log}_{3}(x^{2} - 4x) = 2.

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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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