一元二次方程是中考命题的“重头戏” .近年来 ,围绕着“重在基础 ,突出能力” ,中考试题出现了一些精彩的一元二次方程题 .现举几个典型的例子加以说明 ,供同学们学习时参考 .一、设有隐含条件的二次方程解决此类问题要注意 :1 用判别式时不可忽视二次项系数不为零这个隐含条 The one-dimensional quadratic equation is the “emphasis” on the proposition of the examination. In recent years, focusing on “focusing on the basics and highlighting the ability”, there have been some wonderful one-dimensional quadratic equations in the examination questions. Now give a few typical examples to illustrate. References for students when learning. First, the quadratic equation with implied conditions to solve such problems should pay attention to: 1 When using discriminants, we can not ignore the implicit coefficient of the quadratic item coefficient is not zero.