在学习了《椭圆及其标准方程》的第一课时后,有学生向笔者提了一个问题:“平面上,到三个定点、四个定点甚至n个定点距离之和为常数的点的轨迹是什么呢?”(以下简称“n个定点问题”)经过一番思考和查阅资料,笔者组织了兴趣小组,利用课余时间开展了研究性学习.这次活动以学习和熟练操作几何画板为基础,探索n个定点问题为主要内容.现将此次活动中 After studying the first class of “Elliptical Equations and Its Standard Equations,” some students asked the author a question: “On the plane, to the point where three fixed points, four fixed points and even n fixed point distances are constant What is the track? ”(Hereinafter referred to as “ n fixed-point question ”) After some thinking and access to information, the author organized an interest group, the use of spare time to carry out research learning.This activity to learn and master the operation Geometric drawing board as the basis, to explore the n fixed-point issue as the main content. Now this event