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12 - 2 = - 10, 16 - 2 = - 4, 18 - 7 = - 11, 20 - 2 = - 8, 11 - 2 = - 9, 19 - 5 = - 14, 13 - 1 = - 12, 20 - 4 = - 16,

חיסור בתחום ה20

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