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huynhtrinh1109
2 năm trước
Hai đội công nhân cùng sửa một đoạn đường .Nếu họ cùng làm thì trong 4 ngày xong công việc . Nếu họ làm riêng thì đội 1 hoàn thành nhanh hơn đội 2 là 6 ngày .Hỏi nếu làm riêng thì mỗi đội làm trong bao nhiêu ngày xong đoạn đường?
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