学生计算较复杂的组合图形面积,常感到困难或发生错误,这往往是由于不会全面准确地识图、不能深刻地领会图意而造成的。因此,在教学中注意引导学生对组合图形进行精细的观察,无论对于提高计算组合图形面积的能力,还是发展空间观念,都具有重要的意义。一般而言,可以从以下几个方面引导学生识图。 Students often find it difficult to make mistakes when calculating the area of ​​complex graphic patterns. This is often due to the fact that they do not fully understand maps and do not comprehend the images. Therefore, it is of great significance to pay attention to guide students in their observation of the combined graphics, whether it is to improve the ability to calculate the area of ​​combined graphics or to develop spatial concepts. In general, students can be guided by the following aspects.