Vero: 12 = 1da + 2u, 10 = 1 decina, 20 = 2 decine, 1da + 3u = 13, 1da = 10u, 11 = 1da + 1u, 15 = 1 da + 5 u, Falso: 16 = 1 da + 9 u, 1da + 5u = 18, 1 da + 2 u = 20, 1 da + 7 u = 10, 5 u + 5 u = 15, 3 u + 6 u = 10,

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