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anna3012001
2 năm trước
Một đội công nhân kỹ thuật tính rằng muốn tiện 6 cái bánh xe phải mất 4 giờ hỏi muốn tiện 1260 bánh xe kiểu ấy thì phải mất bao nhiêu giờ bao nhiêu ngày biết rằng mỗi ngày người công nhân là tám giờ
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