所谓化归思想是在一定条件下,把所求的问题进行转化,使问题容易解决.化归是解决数学问题的一种重要思想方法,几乎所有数学问题的解决都离不开化归.运用化归思想方法处理问题,其目的一般是完成复杂向简单、抽象向直 The so-called return to the idea is under certain conditions, the problem to be transformed, so that the problem is easy to solve.Gathering is an important way to solve mathematical problems, almost all mathematical problems are inseparable from the solution. To the way of thinking to deal with the problem, its purpose is to complete the complex to simple, abstract straight