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1“缘”起同样是一节普通的数学课:复习直线与圆锥曲线.在多媒体上投影出题目之后,我照例留给学生3分钟思考的时间.问题1己知椭圆中心为O,长轴、短轴的长分别为2a、2b(a>b>0),A、B分别为椭圆上的两点,且OA⊥OB,则
1 “edge ” from the same section is an ordinary math lesson: Review of straight lines and conic curves .Project in multimedia on the subject, I give students the usual three minutes to think about the time. Problem 1 known oval center O, The major axis and the minor axis are 2a and 2b respectively (a> b> 0), A and B are respectively two points on the ellipse, and OA ⊥ OB, then