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2 năm trước
Hai người cùng làm một công việc .Nếu làm riêng ,người thứ nhất phải mất 4 giờ, người thứ hai phải mất 5 giờ . Hỏi nếu làm chung thì mỗi giờ cả hai người làm được mấy phần công việc?
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