圆锥曲线中最值问题,是历届高考命题的主要知识点,它包括的知识内容特别丰富,涉及的数学知识较广泛,能促进各科知识的融会贯通.解题方法特别多,本文将介绍巧用代数方法妙求圆锥曲线中最值的常用方法如下:一、巧用二次函数妙求圆锥曲线中的最值例1过定直线2x-y=a与动直线x+2y= Conic curve of the most valuable question, is the main knowledge of the college entrance examination proposition, which includes a wealth of knowledge content, involving a wider range of mathematical knowledge, can promote the mastery of knowledge of various subjects .There are many problem solving methods, this article will introduce the use of clever Algebra method The most commonly used method of coning the most commonly used method is as follows: First, the clever use of quadratic function subtle conic in the case of the most value Example 1 over a straight line 2x-y = a and moving straight line x + 2y =