求抛物线的顶点坐标和对称轴是二次函数的重要内容,由于部分同学对二次函数的顶点式、一般式及交点式掌握不牢固,解题方法不当,在求顶点坐标和对称轴时,出现这样或那样的错误.现将一些同学在练习或测验中常见的错误剖析归结如下,希望能帮助同学们避免错误,走出误区.1.由顶点式求顶点坐标和对称轴常见错误本来由顶点式求顶点坐标和对称轴是最简单、最容 Since the vertex, general and intersection point masters of quadratic functions of some students are not strong enough, and the problem solving method is improper, when finding the vertex coordinate and the symmetry axis, the vertex coordinate and the symmetry axis of the parabola are important contents of the quadratic function. Appear this or that mistake.At present, some students in the practice or test error analysis summarized below, hoping to help students to avoid errors, out of misunderstandings.From the vertex-style vertex coordinates and symmetry axis common mistakes originally from the apex Find the vertex coordinates and the axis of symmetry is the most simple and most tolerant