圆锥曲线中的几何最值和参数取值范围问题实属一类问题,解决的方法是统一的,往往是代数、三角、几何等多方面知识的渗透和综合,函数、方程、不等式、转化、归纳、分类讨论等多种思想的交叉运用,以及换元、数形结合、三角代换等多种方法技巧的灵活运用,考查学生观察、分析、综合 Conic curves in the geometric value and the range of parameter values ​​is a type of problem, the solution is uniform, often algebra, trigonometry, geometry and other aspects of knowledge infiltration and synthesis, functions, equations, inequalities, transformation, Induction, classification and discussion of a variety of ideas such as the cross-use, as well as exchange yuan, the number of forms with the triangle substitution and other methods and techniques of flexible use of student observation, analysis, synthesis