几何图形的分类计数江苏省东台市头灶中学程俊在数学竞赛中经常出现一些几何图形的计数问团，解决这类问题一般是通过分类计数，需要注意的是在计数过程中要做到既不重复又不遗漏．兹举例说明几种分类计数的方法．一、按图形的类型分类计数例１如图１，每相邻的三个圆点组... The classification of geometric figures counted in Dongtai City, Jiangsu Province, head stove middle school Cheng Jun in mathematics competitions often appear some geometric figures to ask questions, to solve this type of problem is generally through the classification count, it is necessary to note that in the counting process to do both Do not repeat and not missed. This is an example of several classification methods. First, according to the type of graphics classification count example 1 as shown in Figure 1, each adjacent three dot groups ...