极限教学的点滴体会同心中学马斯祥高中阶段教学极限概念时，教师往往源于学生对概念难于理解，降低教材的要求，只能依据习惯把概念塞给学生，泛泛地讲授，至多从直观上解释趋近、趋向于一些模糊概念，介绍一些极限运算法则初步机械地运用法则求极限，势必对生动的极限概... Extreme Teaching Experience When students are concentric in Ma Xiang’s senior middle school teaching concept, the teacher often derives from the students’ difficulty in understanding the concepts and reducing the teaching materials. They can only pass the concepts to the students according to their habits and teach them in a generic way. At most, they can explain the trends intuitively. Near and tending to some vague concepts, introducing some of the limit algorithm rules to use the laws to find the limits of the initial mechanical, bound to lively limits...