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loan987654321
2 năm trước
Hãy liệt kê các phần tử của tập hợp A, biết: a) A = {n ∈ N, 1 + 2 + ... + n = 91}. b) A = {n ∈ Z, |n| ≤ 6}. c) A = {n ∈ Z, 3 ≤ |n| ≤ 7}.
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