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Qual o valor de a + b (OBMEP 2017)

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Desafio OBMEP 2017 - Produtos Notáveis Se a - b = 1 e ab = 1, qual é o valor de a² b²? a) 1 b) 2 c) 3 d) 4 e) 5 DEIXE SEU LIKEEEE!!! ♥️♥️

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