一个数连续自乘，乘积的末位数随着连乘个数的增加而发生周期性变化。利用这种变化规律，可以迅速找到多个相同数字连乘积的末位数。我们以“３”为例，先看下表：观察表中数字可以发现，“３”连续乘，乘积的末位数随３的连续乘个数的增加而周期性变化：４个数为一个周期，末 A number of consecutive self-multiplication, the last digit of the product with the multiplication of the number of cyclical changes occur. Use this variation, you can quickly find more than the same number with the last digit of the product. Let's take “3” as an example. Take a look at the following table: Looking at the numbers in the table, we can see that “3” is continuous multiplication. The last digit of the product changes cyclically with the continuous multiplication of 3: 4 Period, end