题海无边,变化多端,就事论事,就题论题,只能事倍功半。习题教学要注重学生解题套路的指导,本文以求线段长度的问题为例,阐述如何指导学生形成解题基本套路。求线段长度是几何题的核心任务,很多求图形的周长、面积、函数关系式等问题,其关键环节还是求线段的长度,求线段长度的问题也经常成为压轴题考查学生的能力,这也是是学生学习、教师教学的难点。求线段长的问题的基本套路:先从边角两大元素考察图 Boundless boundless sea, changing, on the matter, the title of the thesis can only be more effective. Problem-based teaching should pay attention to the guidance of students’ problem-solving routines. This paper takes the length of line segments as an example to illustrate how to guide students to form the basic routines to solve problems. Seeking the length of the line segment is the core task of the geometry, a lot of graphics for the perimeter, area, the relationship between function and other issues, the key link is to find the length of the line segment, the length of the line segment problems often become the finale question test students ability Is also a student learning, teachers teaching difficult. The basic routine for the line length problem: first examine the two elements of the corner map