教学时,对于一些容易混淆的概念,可以用对比的方法,使学生弄清它们之间的区别和联系。对于新教材中“假设”的策略我的理解是:它是解决问题的一种策略,是一种思维方式,“转换”是为了实现“假设”的一种具体实施手段,这两者出现的先后顺序是比较容易混淆的,于是我运用多次对比让学生感悟和体验假设,只有真正地充分地感悟和体验,才能实现对于策略的“悟”。一、对比初识假设对于假设的策略来说,假设只是一个引子,其根本应该是根据两种未知量之间的关系实现假设,是通过“换”来“找”出答案。【片段1】 Teaching, for some confusing concept, you can use a comparative method to enable students to find out the differences between them and contact. My understanding of the “hypothetical” strategy in the new textbook is that it is a solution to the problem and a way of thinking. The “transformation” is a concrete implementation of “hypothetical” , The order in which the two appear is relatively confusing. Therefore, I use multiple comparisons to make students feel and experience the hypotheses. Only when they truly fully understand and experience can they realize the “enlightenment” for the strategy. First, compare the initial hypothesis hypothesis for the strategy, the assumption is only a primer, it should be based on the relationship between the two unknowns to achieve the assumption is through the “to ” to “find ” the answer. Fragment 1