“教为主导 ,学为主体”是现代教学思想的一个基本点 ,是数学教学民主化的具体体现 .在“三角形的内角和”这堂课中 ,东江老师引导学生不断提出问题 ,让学生当主角 ,使学生能把自己的观点和疑惑展现出来 ,师生共同讨论 ,找出解决问题的方法 .既使学生感受到老师的和蔼可亲 ,又 “Teaching as the leading and learning as the main body” is a basic point of modern teaching thinking and a concrete embodiment of the democratization of mathematics teaching. In the “Inside corner of the triangle and in this class”, Dongjiang teacher guides students to constantly ask questions and let students The protagonist will enable students to show their own opinions and doubts. Teachers and students will discuss together to find out ways to solve problems. Even if students feel the amiability of teachers, they