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cach day so nam de tuoi anh bang tuoi em hien nay la
[ 26 - 18 ] : 2 = 4 nam
tuoi anh hien nay la
[ 26 + 4 ] : 2 = 15 tuoi
tuoi em hien nay la
15 - 4 = 11 tuoi
tick nha
hieu so tuoi hai anh em la : [20-16]:2=2 [tuoi]
tuoi anh la : [20+2]:2=11[tuoi]
tuoi em la : 11-2=9
dap so : anh : 11 tuoi
em : 9 tuoi
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ý mình là lấy ở đâu ra từ cong thức nào cơ,tai sao lấy hai tỏng chia cho hai lại ra được hiệu