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一、数形结合,构建模型1.用小正方形摆长方形师:同学们,我们先玩个游戏,每组有10个小正方形卡片,请你们用这些正方形卡片按照表格的要求在方格纸上摆成长方形(演示),看一看各有几种不同的摆法,并完成表格(说明:正方形是特殊的长方形)。看哪个小组最快。(课件出示表格)小正方形卡片个数几种摆法12345678910师:哪个小组上工区展示一下。学生汇报交流:边说边演示(投影展示)。生:用1个小正方形卡片摆成长方形有1种摆法:用2个小正方形卡片有2种摆法(第一种横着一排,第二种竖着一排);
First, the combination of a few figures to build a model square square with a small square Teacher: Classmates, we play a game first, each group has 10 small square cards, please use these square cards in accordance with the requirements of the form on the grid paper Pendulum rectangular (demo), take a look at each of several different pendulum method, and complete the form (Note: the square is a special rectangle). See which group is the fastest (Courseware to produce the form) Number of small square cards several pendulum method 12345678910 Teacher: Which group on the work area to show. Students report exchange: talk and talk (projection display). Students: a small square card with a square pendulum There are 1 kinds of pendulum: 2 small square cards have two kinds of pendulum (the first row of a row, the second row of a vertical);