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N（名词） a mathematical theorem that gives the expansion of any binomial raised to a positive integral power, n. It contains n + 1 terms: (x + a) = + nxn–1a + [n(n–1)/2] –²a² +…+ () – + … + , where () = n!/(n–k)!k!, the number of combinations of k items selected from n 二项式定理