一天,张老师和小明在一起探讨一个有趣的数学问题.张老师对小明说:“自然数中有着许多奇妙有趣的现象,很多秘密等待着我们大家去探究!比如:对任意一个正整数,先将其各位数字求和,再将其和乘以9,多次重复这种操作运算,最终它会掉入一个数字‘陷阱’,永远也别想逃出来,没有一个正 One day, Zhang and Xiaoming discussed an interesting mathematical problem. Teacher Zhang said to Xiao Ming: “There are many wonderful and interesting phenomena in natural numbers. Many secrets are waiting for us to explore! For example, for any positive integer, first Each of its digits is summed, then the sum is multiplied by 9, and this operation is repeated several times. Eventually it will fall into a number ’trap’ and never even want to escape.