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较复杂的求平均数应用题是六年制小学数学第九册的重要内容。通过期末复习,应使学生进一步理解和掌握较复杂的求平均数应用题的数量关系、解题思路和解题规律,并能正确、熟练地解答有关的应用题。一、抓基础,强化数量关系 1.思考:什么叫平均数?要求平均数必须知道哪两个条件?怎样求平均数? 2.口头列式,并说出依据的数量关系。①一块8亩的麦田,共收麦子1600千克,平均每亩收多少千克?
The more complicated averaging problem is an important part of the ninth grade of six-year elementary mathematics. Through the end of the review, should enable students to further understand and grasp the more complex average number of the relationship between application questions, problem-solving ideas and problem-solving rules, and correctly and skillfully answer relevant application questions. First, grasp the foundation, to strengthen the relationship between quantity 1. Thinking: What is the average? Requirements Average must know which two conditions? How to average? 2. Oral formula, and to say that the number of relations. ① a piece of 8 acres of wheat fields, received a total of 1600 kilograms of wheat, the average per acre received more than a few kilograms?