论文部分内容阅读
在近几年的小学数学竞赛中,行程问题的内容丰富多采。有的题目仅从速度、时间、路程这三个量之间的关系去分析难以奏效,请看下面几题。例1甲、乙、两车同时从A、B两地相向而行,第一次两车在距B地64千米处相遇,相遇后两车仍以原速继续行驶,并在到达对方站后,立即沿原路返回。途中两车在距A地48千米处相遇。两次相遇点相距多少千米?[解析]为了更好的理解题意,可以画出下面的线段图。
In elementary school mathematics competitions in recent years, the content of travel problems is rich and varied. Some topics only from the speed, time, distance between the three quantities to analyze the relationship between the ineffective, see the following questions. Example 1 A, B, two cars at the same time from A, B two opposite, the first two cars at a distance of 64 km from B to meet the two cars are still driving at the original speed, and arrived at the other station Immediately return along the same route. Two cars on the way from the A to 48 km met. How many kilometers between the two encounter points? [Resolved] In order to better understand the meaning of questions, you can draw the following line segment.