图形的变换穿插于初中数学课本,其与函数的结合对部分学生而言却较难掌握,尤其二次函数。究其原因,二次函数有着可相互转换的多种解析式,很多同学没有真正掌握,常纠结于解析式的选择,不能灵活恰当地去完成变换。初中阶段三大类图形变换:平移、翻折和旋转。二次函数图像就存在利用这三种变换而编出的题目,二次函数的解析式主要有两类:一般式y=ax2+bx+c(a≠0)和顶点式y=a(x-h)2+k。对 Graphic transformation interspersed in junior high school math textbooks, the combination of the function with some students is more difficult to grasp, especially the quadratic function. The reason for this is that the quadratic functions have many kinds of analytical expressions that can be switched to each other. Many of the students do not have any real mastery and are often entangled in analytic choices and can not complete the transformation flexibly and properly. Junior high school three categories of graphics transformation: translation, folding and rotation. The quadratic function image has the problem of using these three transformations. There are mainly two kinds of analytic formulas for the quadratic function: general formula y = ax2 + bx + c (a ≠ 0) and vertex y = a ) 2 + k. Correct