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Mynguyen123
2 năm trước
16 người đào một đoạn kênh hết 8 ngày. Người ta bổ sung thêm 32 người nữa cùng đào thì mất bao lâu sẽ đào xong đoạn kênh. Biết mức đào của mỗi người là như nhau.
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