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赋值法是给代数式(或方程或函数)表达式中的某些字母赋予一定的特殊值,在解决二项式系数的有关问题时,一般依据二项式定理的展开式(a+
Assignment method is to give some special value to some letters in algebraic expression (or equation or function). When solving the problems of binomial coefficient, it is generally based on the expansion of binomial theorem (a+