运用数学开放题教学，对培养学生的探索精神、创新意识和主体意识，增强学习兴趣具有十分重要的作用。下面以一节立体几何复习课为例来说明运用开放题进行教学的方法。１．提出问题 用投影仪出示问题。如图１，ＡＢ是⊙Ｏ的直径，ＰＡ垂直于⊙Ｏ所在平面，Ｃ是圆周上异于Ａ、Ｂ The use of mathematics open question teaching has a very important role in cultivating students’ exploration spirit, innovation consciousness and subject consciousness, and enhancing learning interest. The following uses a three-dimensional geometry review class as an example to illustrate the use of open questions for teaching methods. 1. Ask questions Use the projector to show the problem. In Figure 1, AB is the diameter of ⊙O, PA is perpendicular to the plane of ⊙O, and C is circumferentially different from A, B.