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“充要条件”的内容在高中数学中的重要性毋庸置疑,可以说,“充要条件”贯穿了整个概念教学,像“一把尺子”一样可以检测对概念的理解程度.人教版和苏教版教材中简化了定义,增加了这部分习题的数量和难度,对高二学生来说理解、运用常感觉困难.回顾定义:一般地,如果pq,那么称p是q的充分条件,同时q是p的必要条件.在教学实践中对于定义的前半段“如果pq,那么称p是q的充分条件”学生容易理解,但是对于定义的后半
The importance of “necessary and sufficient conditions” in high school mathematics is undoubted. It can be said that “requirements ” permeates the entire concept of teaching and can be used as a “rule of ruler” to detect understanding of concepts. Degree. The definition of the textbooks for the People’s Education Press and the Jiangsu Education Press simplifies the definition and increases the number and difficulty of this part of the exercise. It is often difficult for seniors to understand and use. Review Definition: Generally, if pq, then p is a sufficient condition for q, and q is a necessary condition for p. In the teaching practice for the first half of the definition "if p q, then p is a sufficient condition for q students are easy to understand, but for the definition of half