分类思想就是把所研究的问题按照某种标准分成若干种情况,然后分情况一一解决,从而使整个问题得到解决·我们在解几何题时,经常会碰到这种情况,特别是某些没有给出图形的几何题,可能隐藏着多种情况,这需要学生有系统的基础知识,全面周到的思考方法,分类解决·近年的中考和数学 The idea of ​​classification is to divide the problem under study into a number of situations according to certain criteria, and then to solve the problems one by one so that the entire problem can be solved. We often encounter this situation when solving geometric problems, especially certain There is no graphic geometry problem that may hide a variety of situations. This requires students to have a systematic knowledge of the basics, a thorough and thoughtful way of thinking, classification solutions, recent examinations and mathematics