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2 năm trước
Bài 3. Một trường học huy động học sinh đi cuốc đất tăng gia, hôm đầu 30 em cuốc đất trong 2 giờ được 32{{m}^{2}}. Hỏi hôm sau 50 em cuốc đất trong 3 giờ được bao nhiêu mét vuông ? (biết năng suất mỗi em đều như nhau)
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