一、活动内容 :通分子求比法及其应用。二、活动目标 :１ 理解通分子求比的方法。２ 加深对分数的意义和比的意义的理解。３ 应用通分子求比法 ,解答较复杂的应用题。三、活动过程 :（一）启动导入１ 涂一涂 :根据分数在图中涂色２ 填一填 :（１）上题（１）中甲的一份与乙的一 First, the activity: Through the numerator and its application. Second, the activities of Objectives: 1 understand the method of molecular comparison. 2 deepen the understanding of the meaning of meaning and the meaning of the ratio. 3 Applications Molecule comparison method to answer more complex questions. Third, the activities of the process: (a) start the import 1 Tu a Tu: According to the points in the picture painted 2 fill a fill: (1) on the title (1) A copy of a and B