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hangbs1983
2 năm trước
bài 1 : khoanh tròn đáp án đúng a) cho tập hợp A = ∫1;2'3'4'5 ∫ cách viết nào sau đây đúng A) 1;2 ∈ A B ) 5 ∉ A C ) 4 ∈ A d) 0 ∈ A b)tập hợp của các chữ số 2021 là : A) 2;0;2;1 B) 2;1 C 0;1;2;2 D ) 0;1;2
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