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2 năm trước
Một thùng đựng xăng có 45l xăng . Lần một người ta lấy đi 20% số xăng đó. Lần thứ hai người tiếp tục lấy đi 2/3 số xăng còn lại . Hỏi cuối cùng thùng xăng còn bao nhiêu lít xăng ? em cảm ơn
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