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一、教材分析与理解“公园有多宽”是北师大版数学八年级上册第二章实数第四节课内容。主要知识目标是使学生理解估算的方法并能应用估算的方法比较两个无理数的大小。前三节课由生活实例引出的数不够用了,近而得出无理数的意义及应用;而第五节课是应用计算器进行开方计算。从表面上看本节课的教学内容似乎可有可无,班型大的班级或是教学任务紧时,教师完全有可能一
First, the textbook analysis and understanding of “how wide the park” is the sixth edition of the eighth edition of mathematics in the eighth edition of the fourth volume of real book content. The main goal of knowledge is to enable students to understand the method of estimation and to apply the method of estimation to compare the size of two irrational numbers. The first three lessons from the life examples of the number of not enough, almost come to the meaning of irrational numbers and applications; and the fifth lesson is to use the calculator to carry out the calculation. On the surface, the contents of this lesson may seem dispensable. When the class size is large or the teaching task is tight, it is quite possible that the teacher