通过对一些问题的变式教学探索(或变条件,或变结论,或条件与结论同时变等),可发展学生思维的灵活性与创造性,培养和训练学生思维的变通性.历年高考试题均有部分是源于教材中的结论或类题变式而得,因此,教学中必须给以足够的重视,以开阔学生的视野,活跃和锻炼学生的思维.高... By exploring (or changing conditions, or concluding, or changing the conditions and conclusions at the same time) of variant teaching of some problems, it is possible to develop the flexibility and creativity of students’ thinking, and to train and train the flexibility of students’ thinking. Some of them are derived from the conclusions of textbooks or variants of class questions. Therefore, teaching must be given enough attention to broaden students’ horizons, and to actively and train students’ thinking. High...