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duhu9ng21012002
2 năm trước
Câu 1:Tìm số tự nhiên x biết: (2x+1) chia hết cho (6-x) Câu 2:Cho A=3+3^2+3^3+......+3^2015.Tìm số tự nhiên n để 2A+3+3^4n
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