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一、情境导入,提取信息师:今年清明小长假的时候,贵州省毕节地区发生了一起严重的交通事故。一辆载满乘客的中巴车坠下河床,造成大量的人员伤亡。一批伤员需要送往医院进行抢救。(出示信息:值班医生要打电话通知15名休假的医护人员马上赶到医院抢救伤员,如果用打电话的方式通知,每分钟可以通知1人。)师:通过阅读,你了解了哪些信息?师:是的,用打电话的方式通知。这节课我们就来研究“打电话”中的数学问题。(板书课题:
First, the situation into the information extraction division: Qingming small holiday this year, Guizhou Province, Bijie occurred a serious traffic accident. A bus full of passengers crashed into the riverbed, causing a large number of casualties. A group of wounded need to be taken to the hospital for rescue. (Show information: The doctor on duty will call 15 medical workers on leave to call the hospital immediately to rescue the wounded, and one person can be notified every minute if notified by phone.) Teacher: What information do you know through reading? Teacher: Yes, let me know by phone. In this lesson, we will study the mathematical problems of “phoning.” (Blackboard topic: