教学的宗旨是通过教师的讲解,让学生从中汲取知识,达到用所学知识解决实际问题的能力。而学案教学发挥了学生的主体地位,让学生在教师的引导下,通过学生自主学习的过程中发现问题、解决问题,而教师只能进行帮助和指导,不能代替学生去思考,可以把时间还给学生,让他们自由发挥,活跃课堂气氛,激发学生学习知识的兴趣。 The purpose of teaching is through teachers to explain, to enable students to learn from it, to achieve the ability to solve practical problems with the knowledge. The case teaching to play the dominant position of students, so that students under the guidance of the teacher through the process of student learning to find problems and solve problems, and teachers can only help and guidance, can not replace students to think, you can put time Back to students, let them play freely, active classroom atmosphere, stimulate students interest in learning knowledge.