论文部分内容阅读
在初中数学教学中关于距离的概念曾经出现过三次:1.两点之间,线段最短;2.在点到直线距离中,垂线段最短;3.平行线间的距离处处相等。在教学教研中“将军、饮马、河”的问题成为一个经典,从而引起我更多的关于“最短距离”的思考。问题一:如图所示,有一位将军骑着马要从A地走到B地,但途中马要到河里喝一次水,将军怎样走最近。乍一看似乎无从下手。观察发现可用“两点之间,线段
In junior high school mathematics teaching about the concept of distance has appeared three times: 1. Between two points, the shortest line; 2. In the point to the straight line distance, the shortest vertical line segment; 3. The distance between parallel lines everywhere. In teaching and research, ”the general, Yin Ma, and River“ became a classic issue, which caused me to think more about ”the shortest distance “. Question 1: As shown, a general riding a horse from A to B, but on the way to the river to drink a drink of water, the generals how to go recently. At first glance it seems impossible to start. Observation found available ”between two points, line segments