Quanto fa 2+7, 7, 9, 10 , 15, Quanto fa 6+9, 15, 12, 16, 21, Quanto fa 1+0, 0, 8, 5, 1, Quanto fa 5+6, 12, 11, 15, 9, Quanto fa 3+9, 15, 14, 9, 12.

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