1 课本上椭圆的画法是怎样想出来的?文[1]从四位老师对椭圆定义教学的设计进行分析比较,分析各自的特点,评判各自的优劣.可以说四位老师都独具匠心,各有所长.但分析再三,总有一种“帽子里变出兔子”的感觉,第一次学椭圆的学生怎么能想到这些呢?真正的数学应该是自然思维的产物, 1 How does the elliptical drawing method in the textbook come about? The article [1] analyzes and compares the design of elliptical definition teaching from four teachers, analyzes their characteristics, and judges the merits of each. It can be said that the four teachers are all originality. Each has its own strengths. But again and again, there is always a feeling of “bunny in the hat”. How can the students who learn the ellipse for the first time think of this? Real mathematics should be the product of natural thinking.