“速度的变化”是《变量之间的关系》一章中的重要一节,考查用图象法直观形象地表示自变量与因变量之间的关系.例1(2005年常德市)小明骑自行车上学,开始以正常速度匀速行驶,但行至中途自行车出了故障,只好停下来修车.车修好后,因怕耽误上课,他比修车前加快了骑车速度匀速行驶下 “Variation of speed” is an important section in the chapter “Relations Between Variables”, examining visually and graphically representing the relationship between independent variables and dependent variables. Example 1 (2005 Changde City) Xiao Ming riding The bike went to school and began to run at a normal speed. However, the bicycle stopped working to repair the car. After the car was repaired, he had to speed up the bike at a uniform speed before he was repaired.