leviathon25012010 leviathon25012010

22-02-2024
Mathematics

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Cho S = 1 x 2 x 3 + 2 x 3 x 4 + 3 x 4 x 5 + ... + n x (n + 1) x (n + 2) .Chứng minh s không là số chính phương

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