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Mathematics, 17.06.2021 19:00 puppycity78

Giả sử A là tập các cặp số nguyên dương (có thứ tự). Trên A có định nghĩa quan hệ R như sau: (a, b) R (c, d) khi và chỉ khi a+d=b+c. a. Chứng minh rằng R là một quan hệ tương đương. b. Tìm lớp tương đương của phần tử (2, 4).

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Giả sử A là tập các cặp số nguyên dương (có thứ tự). Trên A có định nghĩa quan hệ R như sau: (a, b)...
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