Corretto: 5 + 5 = 10, 8 + 7 = 15, 6 + 6 = 12, 6 + 7 = 13, 7 + 7 = 14, 8 + 8 = 16, 7 + 6 = 13, 9 + 9 = 18, 12 - 6 =6, 16 - 8 = 8, 14 - 7 = 7, 18 - 9 = 9, Errato: 5 + 5= 12 , 8 + 7 = 14, 6 + 6 = 14, 6 + 7 = 11, 7 + 7 = 12, 8 + 8 = 18, 7 + 6 = 14, 9 + 9 = 19, 12 - 6= 5, 16 -8= 6, 14 - 7= 6, 18 - 9= 10,

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