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  • 17-01-2024
  • Mathematics
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Tập con Tập A được gọi là tập con của tập hợp X, nếu mọi phần tử của A đều là phần tử của X ký hiệu là ACX (ACXXEA → Χ €Χ) Đọc X bao hàm A" hoặc A là tập con của X

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