一、引言所谓“化归”就是转化和归结的意思,是把待解决的或未解决的问题,通过某种转化过程,归结到一类已经能解决或比较容易解决的问题中去,最终求得原问题之解答的一种手段和方法。郑毓信教授指出“数学家们特别善于使用化归的方法来解决问题,这也就是说,在 I. Introduction The so-called ”conversion“ is the meaning of conversion and summation. It refers to the problem of being solved or not solved through some kind of conversion process, to a class of problems that have been solved or are relatively easy to solve, The final solution to the original problem of a means and method. Professor Zheng Yuxin pointed out that ”mathematicians are particularly adept at using the naturalization method to solve problems. That is to say, at