Verdadeiro: 20 + 20 = 40, 30 + 2 = 32, 8 + 4 = 12, 10 + 5 = 15, 19 +1 = 20, Falso: 12 + 2 = 15, 14 + 2 = 11, 9 + 2 = 12, 20 + 5 = 30, 14 + 2 = 17,

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