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1 2^n - Math Forum - Ask Dr. Math
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日期:2025-05-17
It makes use of this cubing pattern: (x + 1)^3 = x^3 + 3x^2 + 3x + 1 That ... The left side is the sum of the cubes from 1 to n+1: 1^3 + 2^3 + 3^3 + ....看更多