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cô giáo có ít hơn 50 quyển vở và nhiều hơn 30 quyển vở. biết rằng nếu cô giáo chia số vở đó cho 5 bạn hoặc 3 bạn thì không thừa , không thiếu quyển nào. tìm số vở cô giáo có
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