离心率在圆锥曲线内容中是一个非常活跃的角色.求离心率范围既是重点也是难点,涉及到离心率e的问题灵活多变,在求离心率范围时如何建立a、b、c的不等量关系是解题的关键.本文就如何正确建立a、b、c的不等量关系以求出离心率范围,举例谈谈解题的规律性,供大家参考.一、直接建立关于a,c的不等式,整体求e Centrifugal rate is a very active role in the conic content. To find the range of eccentricity is not only the focus but also the difficulty. The problems related to the eccentricity e are flexible. How to establish a, b, c in the range of eccentricity? Quantity relationship is the key to solve the problem.This article on how to correctly establish the relationship between the unequal amount of a, b, c to find the range of eccentricities, for example, to talk about the regularity of the problem for your reference.A direct establishment of a, The inequality of c, the overall demand e