在与学生交流中发现他们有一种观点:概念课可以上得快一些,不必要花功夫、抠字眼,多讲一些题,题解多了,分数自然会高。确实题海战术能弥补概念理解上的不足,但就题讲题,常常会造成学生对见过的题能照猫画虎的会做一些,但又不能得满分,没见过的题就不会分析。也就是同学们经常问的是:“你怎么想到那样做,我怎么就不会?”因此若能抓住概念的实质,弄懂所以然,问题就迎刃而解。 等价转化是非常重要的数学思想方法。转化过程体现了学生综合思维的水平和能力。很多问题往往可 In the communication with students, they found that they have a point of view: concept lessons can be faster, there is no need to spend effort, ambiguous words, more questions, more questions, and scores will naturally be higher. It is true that the sea tactics can make up for the lack of understanding of the concept, but on the topic, it will often cause students to do some of the problems they have seen, but they can’t get full scores. Problems that haven’t been seen will not be analyzed. That is, the students often ask is: “How do you think of that, how can I not?” So if you can grasp the essence of the concept, understand why, the problem will be solved. Equivalent transformation is a very important mathematical thinking method. The transformation process reflects the level and ability of students’ comprehensive thinking. Many problems can often be