我们经常见到这样一些数学课:有的教师讲得井井有条,知识分析透彻,算理演绎清晰,学生听得轻轻松松,似乎明明白白,但稍遇变式和实际问题却往往束手无策;有的教师设计了许多细碎的问题,师生之间一问一答,频率很高,表面上看十分流畅,但结果检测学生知识的掌握和能力的形成却并不理想;有的教师注重精讲 We often see math classes like this: Some teachers are well-organized, their knowledge is well-understood, and their explanations are clear. The students can easily understand what seems to be plainly understandable, but the slightest distortion and practical problems are often overwhelmed. Some Teachers have designed many finely-grasped questions. Frequently asked questions and answers are made between teachers and students. The frequency is high and on the surface very smooth. However, the result of testing students’ mastery of knowledge and ability is not ideal.