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History, 18.06.2021 22:30 meechristianp

1. Kí hiệu các tập bằng các chữ cái lớn: A, B, …, N, X, Y, … Kí hiệu các phần tử của tập là các chữ cái nhỏ: a, b, x, y, … Hệ thức nào sau đây là đúng?

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1. Kí hiệu các tập bằng các chữ cái lớn: A, B, …, N, X, Y, … Kí hiệu các phần tử của tập là các chữ...
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