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14 - 4 = - 10, 18 - 2 = - 6, 8 + 7 = - 15, 9 + 4 =  - 13, 15 - 4 = - 11, 6 + 6 = - 12, 20 - 2 = - 18, 15 + 4 = - 19,

חיבור וחיסור בתחום ה20

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