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4.Viết mỗi tập hợp sau bằng cách chỉ ra tính chất đặc trưng cho các phần tử của tập hợp đó : a) A = {0;3;6;9;12;15}; b) B = {5;10;15;20;25;30 }; c) C= { 10;20;30;40;50;60;70;80;90 } d) D = { 1;5;9;13;17 }
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