数学是思维的体操,而问题是数学的心脏.在课堂教学中,集适宜性、递进性、指向性于一身的“问题串”可以促进学生积极思考.现以华东师大出版社九年级上册第24章第4节“解直角三角形”第1课时为例,谈谈如何通过创设“问题串”来启迪学生的思维.一、教学目标(1)知道解直角三角形的概念,理解解直角三角形所包含的两种情况:已知两条边、已知一条边和一个锐角.(2)能利用直角三角形的边角关系解直角三角形. Mathematics is the gymnastics of thinking, and the problem is the heart of mathematics.In the classroom teaching, set the appropriate, progressive, directional in a “string of questions” can promote students to think positively. Now in East China Normal University Press Grade 9 Chapter 24 Section 4 “solution of right triangle ” Lesson 1, for example, to talk about how to create a “problem string ” to inspire students thinking.A teaching goal (1) know the right angle triangle , Understand the two cases involved in solving a right-angled triangle: two edges are known, one is known and one is acute. (2) The right-angled triangle can be solved by the corner relation of a right-angled triangle.