数学解题的实质就是实现将问题由复杂向简单、由未知向已知转化.所以,解题时恰到好处地运用转化与化归思想,常可使问题变繁为简、化难为易,收到事半功倍之效.本文举例谈谈数学解题中常见的转化与化归思想.1主元与辅元的转化利用主元与参变量的关系,视参变量为主元,常常可以简化 The essence of mathematical problem solving is to realize the problem from complex to simple, from unknown to known transformation .Therefore, the problem-solving just right to use conversion and return to the ideology, often make the problem become more complex, difficult as easy, received Do more with less .This article gives an example to talk about common transformation and return to normal thinking in solving mathematical problems.1 The transformation of principal components and auxiliary components can be simplified by using the relationship between principal components and parameters.