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Bài 4. Cho tập hợp A = {1; 2; a; b} a/ Hãy viết các tập hợp con của A có 1 phần tử. b/ Hãy chỉ rõ các tập hợp con của A có 2 phần tử. c/ Tập hợp B = {a, b, c} có phải là tập hợp con của A không?
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