Một đội thanh niên là công tác cứu trợ vùng bị thiên tai gồm 144 nữ và 360 nam .Người ta muốn chia đội thành nhiều tổ sao cho mỗi tổ số nam và nữ bằng nhau. a)Có bao nhiêu cách chia b)Mỗi tổ có ít nhất bao nhiêu người ?

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