很多同学反映，学习平面几何时，课堂上老师讲证明题时听得懂，但自己却做不来．一看到证明题，不知从何着手．这说明同学们还没有掌握几何证明的思考方法．我们学习数学的目的决不能停留在上课听得懂上，也就是说，我们向老师学的决不是在老师那儿拿“几袋干粮”的问题．而是 Many classmates reported that when studying plane geometry, the teacher in the class could understand the proofs, but he could not do it himself. When you see the proof, you do not know where to start. This shows that the students have not yet grasped the way of thinking of geometric proof. The purpose of our study of mathematics must not remain in the class and understand it. That is to say, what we learn from our teacher is not the question of taking a few bags of dry food at the teacher. But