我校是一所典型的山区农村初中校,所招收的学生知识基础参差不齐,这与班级统一的教学构成一对矛盾,是提高教学质量最棘手的问题.成功的教学应是使课堂四十五分钟尽可能成为各个层次学生的有效学习时间.为此,我在多年的数学教学中,采用了“DXDK”模式,即“低起点,小步子,多活动, Our school is a typical rural junior high school in rural areas. The knowledge base for students enrolled is uneven. This is inconsistent with the unified teaching of the class and is the most intractable problem in improving teaching quality. Successful teaching should make the classroom four. Fifteen minutes has become an effective learning time for students at all levels. To this end, I have used the “DXDK” model in my mathematics teaching for many years, ie “low starting point, small steps, multiple activities,