函数是研究运动变化的重要数学模型,函数图象又是直观地描述和研究函数的重要工具.由于对函数本质的理解不到位,对变化中的数量关系的理解不深入,以及数与形双向沟通的不顺畅,在利用一次函数图象解决实际问题时,有的学生认识上存在一些误区.一、数形分家,求解析式时的误区例1甲、乙两车从A地出发,沿同一条高速公路行驶至距A地400km的B地.l1、l2分别表示甲、乙两车行驶路程 Function is an important mathematic model to study the change of movement, and function image is an important tool to describe and study function intuitively.As the understanding of the essence of function is not in place, the understanding of quantitative relation in change is not deep, Communication is not smooth, in the use of a functional image to solve practical problems, some students have some misunderstanding on the understanding.First, the number of sub-family, the analysis of errors when cases 1 A, B and two vehicles starting from A, Along the same highway to a distance of 400km away from the B site .l1, l2, respectively, that two vehicles A and B driving range