Corretto: 0 + 2 = +2, -1 - 3 = -4, +2 - 8 = -6, -6 + 6 = 0, -3 - 10 = -13, +4 + 8 = +12, -4 + 9 = +5, +6 - 8 = -2, -13 + 4 = -9, +12 -10 = +2, +8 - 7 = +1, -10 + 0 = -10, +20 - 18 = +2, +9 - 13 = -4, -11 - 9 = -20, Errato: +1 - 2 = +1, -2 - 4 = +6, -3 + 8 = +4, +10 - 2 = -5, -5 + 5 = +5, -8 + 3 = +5, -7 - 10 = -3, +5 + 8 = +10, -18 -2 = -14, -15 -10 = -5, +11 - 9 = +20, -14 -2 = -12, -20 +5 = +15, -19 -2 = -18, +9 - 8 = -1,

Numeri relativi - Semplici somme algebriche

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