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1上一周的课结束时，给学生发下了如下的一张准备题组（说明：可以讨论；欢迎找资料参考）．2一段时间后，教师召集一些小组长碰头：点拨；分工──明确一些小组探讨的重点方法、方向；提点要求，并解答疑难处3上课了．教师简明地说：这些问题中的共同课题，是圆锥曲线中的弦长
1 At the end of the last week’s class, the student was sent the following preparation question (Note: You can discuss; please refer to the information for reference). 2 After a period of time, the teacher summoned some of the group leaders to meet: redeployment; division of labor - to clarify the key methods and directions explored by some of the groups; to ask for points, and to answer difficult questions in class 3. The teacher concisely stated that the common problem in these problems is the chord length in the conic section.