Dãy Số Viết Theo Quy Luật - Bài 4: A = 1.2.3 + 2.3.4 + 3.4.5 + … + (n

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Từ khóa » Tính B = 1.2.3 + 2.3.4 + ... + (n - 1)n(n + 1)