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在许多关于整数整除性的小册子中都谈到了求形如(?)的个位数的问题,但都只就某一个具体的数来谈它的求法,没有形成一般方法。本文给出这个问题的一般求法,
In many pamphlets on integer divisibility, the problem of single digits such as (?) has been discussed, but all of them talk about its solution to a specific number. There is no general method. This article gives a general approach to this problem.