1引言最近,浙江省象山县贤庠中学数学组举行了一次以“圆(1)”(浙教版《义务教育课程标准实验教科书.数学》九年级上册第3章第1节第1课时的内容)为载体的“同课异构”式课堂教学研讨活动.课堂观察发现:尽管不同的教师对这节课的把握有所不同,教法也有差异,但普遍存在着值得关注的问 1 Introduction Recently, Xiangyang High School Mathematics Group in Xiangshan County, Zhejiang Province, held a “Circle (1)” (Zhejiang version of “compulsory education curriculum standard experimental textbook. Class content ”) as the carrier “ classroom heterogeneous ”classroom teaching seminars.Classroom observation found that: although different teachers have different grasp of this lesson, teaching methods are also different, but there is widespread concern Ask