有关函数图象的选择题在高考中经常出现 ,这些选择题可分为两种类型 :1.已知函数的图象 ,求与函数解析式有关的问题 ;2 .已知函数的解析式 ,判断函数的图象 .其解法应注意两点 :1)抓住特殊值或特殊点 (包括函数图象所经过的特殊点、对称中心、圆心等 ) ;2 )弄清函数的性质 ,包 Multiple-choice questions about function images often appear in the college entrance examination. These multiple-choice questions can be divided into two types: 1. The image of the known function, and the problems related to the analytic expression of the function; 2. The analytical formula of the known function, To judge the image of a function, its solution should pay attention to two points: 1) Grasp the special value or special point (including the special point, symmetry center, circle center, etc.) of the function image; 2) Find out the nature of the function, package