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خصائص الجمع و الطرح
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18+25=25+18
الإبدال
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العدد المفقود 0+ .....=7
7
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8 - 8 = 0
طرح العدد من نفسه
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3- 0 = 3
طرح الصفر
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12 - ..................= 12
0
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6 - 6 =................
0
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9 -........... = 9
0
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5+ 0 = 5
العنصر المحايد
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العدد المفقود 22 + 15 = .............+ 22
15
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7 + 1 + 8 = 1 +.............. + 8
7
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15 + 0 = 15
العنصر المجايد
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( 5 + 7 ) + 3 = 5 + ( 7 + 3 )
التجميع
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