我们常研究曲线、函数的图象,以求通过直观、简洁的方式形象地研究函数、曲线的变化趋势,尽可能准确地画图象.考虑函数的图象与性质时,总离不开对特殊元素(点、线)的研究,点是函数图象最基础的细胞,点的特征反映了图象的特征.函数图象中的特殊点决定着解题的繁难程度,甚至决定着解题的成败,不得不引起重视,下面结 We often study the curve, the function of the image, in order to visually and succinctly vividly study the function, the tendency of the curve, as much as possible to draw the image. Consider the function of the image and nature, always inseparable from The study of special elements (points, lines) is the most basic cell of the function image, and the characteristics of the dots reflect the characteristics of the image. The special points in the function image determine the degree of difficulty of solving the problem and even determine the solution to the problem The success or failure, have attracted great attention, the following conclusion