求离心率的取值范围在高考中属于常考内容,是高考的一个热点,也是一个难点.此类题目一般为中档题,通常以填空题形式出现,而解答题中有时也会出现,此类题目也属于中档题题.求离心率的取值范围涉及解析几何、平面几何、代数等多个知识点,综合性强方法灵活,难点在于建立不等关 Find the value of the range of eccentric examination in the college entrance examination are often test content, is a hot college entrance examination, but also a difficulty. Such topics are generally mid-range questions, usually in the form of blank fill questions, and answers sometimes appear in the title, this The topic of the class also belongs to the mid-range question. The range of seeking the eccentric rate involves multiple knowledge points such as analytic geometry, plane geometry and algebra. The comprehensive method is flexible and the difficulty lies in establishing