列表法和树状图法是解答概率问题最基本最常用的方法，有时两种方法综合应用．本文以2005年中考试题为例，说明应用这两种方法解题的步骤和应注意的事项，供读者参考．例1(陕西省)有两个可以自由转动的均匀转盘A、B，分别被分成4等份、3等份，在每份内标有数字，如图1所示．王扬和刘菲同学用这两个转盘做游戏，游戏规则如下： The list method and the dendrogram method are the most basic and most commonly used methods to solve the probability problem, and sometimes the two methods are applied comprehensively. This article takes the 2005 exam questions as an example to explain the steps to apply the two methods and the matters that should be noted for the reader’s reference. In Example 1 (Shaanxi Province), there are two homogeneous turntables A and B that can be freely rotated. They are divided into four equal parts and three equal parts, and each part is marked with a number, as shown in Figure 1. Wang Yang and Liu Fei used the two turntables to play games. The rules of the game are as follows: