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phanboyc8
2 năm trước
a, cho tập hợp A = { 0 ; 4 ; 8 ; 12 ; ... }. Viết tập hợp A bằng cách nêu tính chất đặc trưng b, B = { 7 ; 10 ; 13 ; ... }. Tìm phần tử số 30 của B
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