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初中数学关于平移的一个问题的分析和解答存在错误,而这个错误隐藏很深,老师们的课堂教学,报刊杂志分析讲解都出现失误,以讹传讹。我把学生分成四组,分组进行合作探究式教学。引入问题:在一块长30m,宽20m的长方形草地上修了两条倾斜交叉且分别通过两组对边的小路,小路的入口出口一样宽,剩余草地面积为551m2,求小路入口出口多少米?四个小组学生几乎采用了统一解法,解法如下:
Junior high school mathematics on the translation of a problem analysis and answer the existence of errors, and this error is very deep hidden, teachers classroom teaching, newspapers and magazines analysis to explain mistakes in order to correct. I divided the students into four groups and conducted cooperative inquiry teaching. The introduction of the problem: In a 30m long, 20m wide rectangular grass on the repair of two oblique cross and respectively through the two groups of opposite side of the road, the entrance of the trail is as wide as the remaining grass area of 551m2, how many meters exit? A group of students almost used a unified solution, the solution is as follows: