[tex](8 - 4) \div 2 = 4 \div 2 = 2 \\ sau \\ (8 - 4) \div 2 = 8 \div 2 - 4 \div = 4 - 2 = 2[/tex]
Folosim formula
[tex](a - b) \div 2 = a \div 2 - b \div 2 \\ ( a+b ) = a\div 2 + b\div 2[/tex]
[tex](10 + 6) \div 2 = 16 \div 2 = 8 \\ sau \\ (10 + 6) \div 2 = 10 \div 2 + 6 \div 2 = 5 + 3 = 8[/tex]
[tex](6 + 4) \div 2 = 10 \div 2 = 5 \\ sau \\ (6 + 4) \div 2 = 6 \div 2 + 4 \div 2 = 3 + 2 = 5[/tex]
[tex](18 - 12) \div 2 = 6 \div 2 = 3 \\ sau \\ (18 - 12) \div 2 = 18 \div 2 - 12 \div 2 = 9 - 6 = 3[/tex]
ฅ^•ﻌ•^ฅฅ^•ﻌ•^ฅฅ^•ﻌ•^ฅ
