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初中教材中介绍了列表法和画树形图法求等可能事件的概率:当一次试验涉及两个层次且可能出现的结果较多时,通常用列表法;当一次试验涉及3个或3个以上的层次时,通常用树形图.虽然便于掌握,但有时较繁琐,特别是求完成事件的层次比较多、或者表面上事件发生的可能性“不相等”的概率时,学生难以入手,容易出现错误,为此,我在相关内容的复习、提升阶段试着向学生介绍了下面三种思想方法.
The junior high school textbook lists the probability of list events and drawing tree events for possible events: When an experiment involves two levels and may have more results, usually using the list method; when an experiment involving three or more Level, it is usually difficult to grasp, but sometimes more complicated, in particular, to find the level of completion of the event is more, or the likelihood of an incident on the surface “not equal ” probability, it is difficult for students to start , Prone to error, therefore, I review the contents of the relevant stages, try to introduce the students to introduce the following three ways.