一、问题的提出在一次函数图象的应用问题中,命题者往往钟爱s-t图象.这类问题虽与学生的实际生活比较贴近,但由于学生对此图象的理解不够,往往得分率不高.杭州市区2012年九年级数学第一次模拟试卷上的一道题:路程s与时间t的大致图象如图1所示,则速度v与时间t的大致图象为 First, the question raised In the application of a function image, the proponents often love st images .Although such issues with the actual life of students closer, but students do not understand this image often, the score is often not High Hangzhou city in 2012 ninth grade mathematics first simulated test paper on a question: the distance s and the time t of the general image shown in Figure 1, the speed v and time t approximate image