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简单的奇偶性分析,常是求解各种问题的一个强有力的而且具有广泛应用的手段。下面分几个方面讨论。一.末位数问题在本节的讨论中,约定各字母都是自然数不再声明。设a∈N,记a的末位数为G(a),显然,G(a)是一个定义在N上的函数,关于G(a)有以下简单性质: 1)和的末位数等于各加项末位数之和的末位数即G(a+b)=G〔G(a)+G(b)〕 2)积的末位数等于各因子末位数之积的末位
Simple parity analysis is often a powerful and widely used method for solving various problems. The following points are discussed in several ways. One. Last digit problem In the discussion of this section, it is agreed that each letter is a natural number and no longer declare. Let a∈N, the last digit of a is G(a). Obviously, G(a) is a function defined on N. It has the following simple properties about G(a): 1) The end of the sum is equal to The last digit of the sum of the last digit of each addition term is G(a+b)=G[G(a)+G(b)] 2) The last digit of the product is equal to the last digit of the product of the last digit of each factor.