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小小的网格构造能够帮助学生解决的不仅仅是问题本身,更多的是让学生体会、理解、运用一种数学思想。近年来,网格问题在一些中考试题中频频出现,这类问题虽然出现在小网格中,却隐藏着大智慧。一些看似复杂的题目,构造在网格中,往往就能迎刃而解。为此笔者针对网格问题做了下面的教学设计。1比较大小例1试比较5~(1/2)+(10)~(1/2)与(13)~(1/2)的大小。学生对此类问题比较有经验,学生分别用估算法
The small grid structure can help students not only solve the problem itself, but also enable students to understand, understand and apply a mathematical idea. In recent years, grid problems frequently appear in some middle school exams. Although such problems appear in small grids, they hide great wisdom. Some seemingly complicated topics, constructed in the grid, often can be solved. To this end the author made the following teaching design for the grid problem. 1 Comparison Example 1 Compare the size of 5 ~ (1/2) + (10) ~ (1/2) and (13) ~ (1/2). Students are more experienced in such issues and students use estimation methods respectively