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一、基本性练习目的在于帮助学生理解求平均数的意义,掌握基本数量关系,概括解题规律。 1.小兰有故事书17本,小华有故事书11本,小兰给小华____本,两人故事书的本数就一样多了。这时平均每人有____本故事书。 2.一辆汽车第一小时行31公里,第二小时行39公里,第三小时行37公里,平均每小时行多少公里? 列式:______________ 数量关系:________ 解题规律:________ 二、突破性练习在总数与总份数之间建立严格的对应关系,是解答较复杂的求平均数应用题的关键。安排突破性练习的目的就是为了帮助学生突破这一解题关键,以使学生更加深刻地理解和掌握数量关系及解题规律。
First, the basic purpose of the practice is to help students understand the meaning of the average, master the relationship between the number of basic principles to solve the problem. 1 Xiaolan storybook 17, Xiaohua storybook 11, Xiaolan to Xiaohua ____ this, the two storybooks of this number is as much. At this time each person has ____ storybook. 2. The first hour of a car traveling 31 kilometers, the second hour 39 kilometers, the third hour 37 kilometers, the average number of kilometers per hour line? Column type: ______________ Number Relationship: ________ Problem solving: ________ Second, the breakthrough Practicing a strict correspondence between the total number and the total number of copies is the key to solving the more complex averaging application problem. The purpose of arranging groundbreaking exercises is to help students break through the key to solving this problem so that students can understand and master the relationship between quantity and problem solving more profoundly.