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Đại số chương 1 - Coggle Diagram

- - - - B={x ∈ Z||x| ≤ 3}
        C={n ∈ Z|-5 ≤ n ≤ 15; n ⋮ 5}
    - - B = {-3; -2; -1; 0; 1; 2; 3}
        B = {-3; -2; -1; 0; 1; 2; 3}