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2 năm trước
Một quầy hàng buổi sáng bán được 2/5 số đường. Buổi chiều bán được 3/4 số đường còn lại sau khi bán buổi sáng thì còn 13,8 kg. Hỏi quầy hàng lúc đầu có bao nhiêu kg đường /
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