根据图象获取信息,并依据信息解决问题是解决物理问题的重要策略。教学中往往由图象面积的单位来推理与面积相关联的物理量,这一推理是或然性推理。通过例题剖析应用图象面积求物理量时的一个隐蔽性错误,并给出相应的教学策略。 According to the image to obtain information, and based on the information to solve the problem is an important strategy to solve physical problems. Teaching is often the unit of image area to infer the physical quantity associated with the area, this reasoning is a probabilistic reasoning. Through the example analysis of the application of the image area for a hidden amount of physical errors, and gives the appropriate teaching strategies.