利用函数图象研究函数的性质,或将抽象的数量关系通过图象直观反映出来,这类问题是数学教学中的重点,也是近年来中考试题的热点之一.本文从2004年中考试题中采撷几例进行简要分析.一、根据系数确定图象例1(河北省中考题)在同一坐标系中,一次函数y=ax+c和二次函数y=ax2+c的图象 The use of function images to study the nature of the function, or to reflect the abstract numerical relationship through the image intuitively, this type of problem is the focus of mathematics teaching, and is also one of the hot topics in the mid-term exam questions in recent years. This article picks from the mid-2004 exam questions. A few cases were analyzed briefly. First, the image was determined according to the coefficient. Example 1 (Hebei provincial examination questions) In the same coordinate system, the image of the primary function y=ax+c and the quadratic function y=ax2+c