近期笔者参加了我市以《一元一次方程解法(1)》为课题的同题异构活动,在遵循“三学”(学生、学材、学法)原则的基础上,通过三易其稿,终有心得收获,现整理如下,以供广大同仁交流切磋.一、初稿1.创设情境问题1学校距离县城20千米,公共汽车行驶0.5小时,正好走完全程,求公共汽车的平均速度.(设公共汽车的平均速度为x千米/时)问题2某校三年一共购买计算机140 Recently, I participated in the city with “one dollar equation solution (1)” as the subject of the same problem of heterogeneous activities, in the “” three "(students, learning materials, learning law) The manuscript, the final experience gains, is now organized as follows, for the exchange and discussion of a large number of my colleagues.First, draft 1 to create a situational problems 1 school 20 kilometers from the county seat, bus 0.5 hours, just go through the whole process, Average speed (set the average speed of the bus x km / hour) Question 2, a total of three years to buy a computer school computer 140