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教学应用题时,为了有效地探寻解题途径,往往编些“比较题”。通过比较,可以启迪思维,发现规律。在多年的教学实践中,我体会到编拟比较题一般有以下五法: 一、变大为小即把应用题中某些数量由大变小,编成比较题与原题对照,能很快找到解题方向。例如.工人叔叔测量公路时,先在起点插一根标杆,以后每隔50米插一根标杆,有一段公路共插了9根标杆,这段公路有多少千米? 这是算术中线状植树问题,题目中有株数(9根)又有株距(50米),要求距离(公路长),应先从株数中减去1(即9-1)后再乘以株距。
Teaching application questions, in order to effectively explore the way to solve problems, often compiled some “more questions.” By comparison, you can inspire thinking and discovering laws. In many years of teaching practice, I realized that the preparation of comparative questions generally have the following five methods: First, the larger the application of the problem that some of the number from big to small, compiled into comparison questions and the original title can be very Quickly find the solution direction. For example, when the worker's uncle measured the road, he first inserted a benchmark at the starting point and then inserted a benchmark every 50 meters. There were a total of 9 poles on a section of the road. How many kilometers did this section of highway have? Questions, the subject of a few (9) and spacing (50 meters), the required distance (long road), should be subtracted from the number of 1 (9-1) and then multiplied by the spacing.