在现实生活中,有一些问题所涉及的知识点很少,看似非常简单,但解答起来却无从下手.究其原因,要解答这些问题,关键是要掌握一些特殊的分析问题与解决问题的数学思想、方法和技巧.染色分类就是解决方法之一. In real life, there are some problems involved in the few knowledge points, seemingly very simple, but it is impossible to answer them. The reason, to answer these questions, the key is to have some special analysis and problem solving Mathematical ideas, methods and techniques. Dyeing classification is one of the solutions.