离心率是圆锥曲线的重要性质之一,离心率取值范围也是高考的热点.本文从几道例题入手,谈谈圆锥曲线离心率取值范围的常见题型和方法.一、利用题目已知条件中存在的不等关系例1已知双曲线x~2/a~2-y~2/b~2=1(a>0,b Centrifugal rate is one of the important properties of conic curve, the range of centrifugal values ​​is also a hot spot in college entrance examination.This article starts with a few examples to talk about the concentric curvilinear eccentricity range of common types and methods. Unequal relations exist in the conditions of Example 1 known hyperbolic x ~ 2 / a ~ 2-y ~ 2 / b ~ 2 = 1 (a> 0, b