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在教学过程中,笔者发现以图象呈现的行程问题,是学生学习中较为困难的内容.本文以近年来出现的这类试题为例,谈谈对此类题型的教学思考.一、相遇问题在函数图象中的应用例1甲乙两地相距400 km,一辆轿车从甲地出发,以一定的速度匀速驶往乙地.0.5h后,一辆货车从乙地出发匀速驶往甲地(轿车的速度大于货车的速度),与轿车在途中相遇.此后,两车继续行驶,并各自到达目的地.两车之间的距离y(km)与轿车行驶的时间
In the teaching process, I found that the image of the itinerary is the more difficult for students to learn the contents of this article in recent years such questions as an example, to talk about the teaching of such questions. Application of the Problem to Function Images Example 1 A and B are 400 km apart and a car leaves from A to B at a constant speed at a constant speed. After 0.5h, a truck leaves from A to A (Car speed is greater than the speed of the truck), and the car met on the way .After that, the two cars continue to travel and reach their respective destinations. The distance between the two y (km) and car travel time