利用列表法或树状图法求随机事件的概率是求解概率问题的常用的方法,而求摸球中的概率又是其中重要的题型,也是中考中重要的考点.学习时若能挖掘课本上的例题或习题,注重对例题、习题的引申、演变,不但能掌握相关题型,而且还能跳出题海 The use of a list method or a dendrogram method to find the probability of a random event is a common method for solving a probability problem, and finding the probability in a touching ball is an important question type, and is also an important test point in the middle exam. If you can learn texts, The examples or exercises on the example focus on the extension and evolution of examples and exercises. Not only can they master relevant questions, but they can also jump out of the sea of ​​questions.