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guan yu yuan zhui qu xian li xin lv de qu zhi fan wei de yi zu jie lun
Author(s): 
Pages: 21-22
Year: Issue:  6
Journal: ZHONGXUE SHUXUE ZAZHI(GAOZHONG BAN)

Abstract:  求圆锥曲线离心率的取值范围,是解析几何中的一类典型问题,这类问题涉及多个知识点,综合性和技巧性强,方法灵活多样,学生很难掌握解题的规律.在教学过程中,笔者发现圆锥曲线离心率的取值范围的一组结论,这一组结论会给我们解决这一类问题带来意想不到的"神奇"效果!现用性质的形式叙述并证明.
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