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phungchu552
2 năm trước
Trên tập hợp N các số tự nhiên, xét quan hệ hai ngôi R cho bởi ảb khi và chỉ khi a và b cùng tính chẵn lẻ 1. CMR đây cũng là một quan hệ có hiệu chia hết cho 2 2. Chung minh rằng R là một quan hệ tương đương 3. Tìm tập thương
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