论文部分内容阅读
在备九年级数学第二十五章概率初步第二节古典概型的第二课,即用列表法或树形图法求概率时.我拟采用“问题情境———建立模型———解释、应用与拓展”的模式展开,设计的教学流程是:先举一个在一次试验中涉及两个因素用直接列举法比较简单的例子求概率;然后用直接列举法比较复杂的例子,也是在一次试验中涉及两个因素,用列表法比较简单;最后举出用列表法有困难,在一次试验中涉及三个因素或三个以上的因素时,要用树形图法求概率的例子.
In the second lesson of the classical outline of the second chapter of the probability of preparation for the ninth grade mathematics, that is, when using the list method or the tree diagram method to calculate the probability, I propose to use the “problem situation—establish the model— -Explanation, application and expansion ", the design of the teaching process is: to give an example in which two factors are involved in a test, a straightforward example to find the probability of a simple example; then use the direct enumeration method to compare the complex examples, It is also involved in two factors in a test. It is relatively simple to use the list method. Finally, it is difficult to use the list method. When three factors or more than three factors are involved in a test, the tree diagram method is used to find the probability. example.