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数学解题的过程,重要的是展示思考问题的思维过程,理解数学问题的本质,从表象中梳理出解决问题的关键,归结到底就是充要条件变形的演化过程.通过研究近几年的各地数学高考试卷,发现一些试题都能通过转换思考角度,运用必要条件简洁明快地解决问题.下面以这些试题为例,阐述必要条件在解题中的应用.
In mathematics problem solving, it is important to demonstrate the thinking process of thinking, to understand the nature of mathematics problems, and to sort out the key to solving problems from appearances. In the end, it is the evolutionary process of the necessary and necessary conditions. Through the research in recent years In the mathematics exam paper, we found that some questions can be solved by converting perspectives and using necessities to solve problems in a simple and neat manner. The following uses these questions as examples to illustrate the application of necessary conditions in problem solving.