4 + 1= 5 - 5 - 4 = 1, 7 + 3 = 10 - 10 - 3 = 7, 6 + 6 = 12 - 12 - 6 = 6, 3 + 4 = 7 - 7 - 4 = 3,

العلاقة بين الجمع و الطرح

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