Report - RESOLUCAO S1 TAREFAS MATEMATICA E 2014 Rose · 16) x2 – 49 = 0 ⇔ x2 = 49 ⇔ x = 49 ⇔ x = 7 V = {– 7; 7} 17) + = ⇔ (x + 2) . (x – 2) + 2 . 2 = – 1 . (x – 2), com x

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