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精彩回放:下面是对第二道助学题的实践和反思。师:同样是比例尺,比比他们有什么相同和不同。生1:我们小组对比发现这里的比例尺的前项都是1。生2:比例尺都是用来缩小生活当中的物体的。生3:我想给你补充,比例尺不都是用来缩小的,也有用来放大的,虽然我没找到实例。但是我能举个例子,比如说2:1表示如上距离2厘米,实际距离1厘米。师:你们有没有找到像这样的放大比例尺?(学生齐答
Wonderful playback: The following is the practice and reflection on the second aid problem. Teacher: The same is the scale, than what they are the same and different. Health 1: Our team found that the scale of the preceding paragraph is 1. Students 2: The scale is used to narrow the objects in life. Student 3: I would like to add to you that the scale is not used to zoom out, but also used to zoom in, although I did not find examples. But I can give an example, for example, 2: 1 said 2 cm above the distance, the actual distance of 1 cm. Teacher: Did you find any magnified scale like this?