在数学课堂教学中,注意适当的“密度”、“难度”、“灵活度”,这对提高课堂教学的效率,培养和发展学生的思维能力,无疑是有益的。但这个密度如果脱离了班级学生的实际,结果会适得其反。我在听一位教师的数学课中,看到这位教师设计的课堂练习题数量多,有层次,有一定的坡度。教师提问时,班内七、八个学生思维比较敏捷,回答的问 In mathematical classroom teaching, pay attention to the appropriate “density”, “difficulty”, “flexibility”, which is to improve the efficiency of classroom teaching, training and development of students' thinking ability is undoubtedly beneficial. But if this density deviates from the reality of class students, the result will be counterproductive. I was listening to a teacher in math class, see the teacher designed the classroom practice a large number, level, there is a certain gradient. Teacher questions, the class seven or eight students thinking more agile, answering questions