Corretto: 3 +4 = 7, 8 + 2 = 10, 7 +3 = 10, 6 + 4 = 10, 5 + 5 = 10, 9 + 1 = 10, 10 + 10 = 20, 10 - 8 = 2, 10 - 7 = 3, 10 - 5 = 5, 9 - 4 = 5, Errato: 3 +4 = 8, 8 + 2 = 11  , 7+ 3 = 12, 6 + 4 = 9, 5 + 5 = 11, 9 + 1 = 11, 10 + 10 = 30, 10 - 8 = 4, 10- 7 = 4, 10 - 5 = 6, 9 - 4 = 7,

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