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Có 4 thùng dầu , trung bình mỗi thùng chứa 18,5 lít dầu . Nếu không tính thùng thứ nhất thì trung bình mỗi thùng còn lại chứa 18,8 lít dầu . Hỏi thùng thứ nhất chứa bao nhiêu lít dầu ? Giải thích cách làm và vì sao lại làm như vậy #DONOTCOPY
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