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【案例一】一、巧设情境,铺垫导入师:(出示一张长方形纸)它的面积怎么算?师:(教师将长方形纸裁剪成由8个平行四边形组成的花)这朵花的面积你会算吗?师:现在老师帮你把这个图形化繁为简。(课件
[Case 1] First, the clever setting situation, bedding Introduction Division: (produce a rectangular paper) how to calculate the area? Teacher: (teacher rectangular paper cut into 8 parallelograms composed of flowers) The flower area Can you count it? Teacher: Now the teacher helps you to simplify this graphically. (Courseware