最小的一位数是什么?要回答这个问题,首先要看这是在什么数集中提出的问题。在自然数集中,最小的一位数是1;在非负整数集(扩充的自然数集)中,最小的一位数是0。理由如次。所谓位数是指一个自然数所含有数位的个数。一位数中所含的元素仅有九个,即数1、2、3、 4、 5、 6、 7、 8、 9,显然1是最小的一位数数。这是 What is the smallest single digit? To answer this question, we must first look at what is the question raised in what number of sets. In the natural number set, the smallest single digit is 1; and in the nonnegative integer set (expanded natural number set), the smallest one digit is 0. The reasons are the same. The so-called median refers to a natural number contains the number of digits. A single digit contains only nine elements, ie, numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, obviously 1 is the smallest one-digit number. this is