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 ,尝试创新”,中考试题中一元二次方程新题型精彩纷呈。一、设计有隐含条件的一元二次方程问题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件 ;2 .用韦达定理时不可忽视二次项 The quadratic equation of one yuan is the “emphasis” of the proposition of the examination. In recent years, focusing on “relying on the foundation, highlighting the ability, and trying to innovate”, the new formula of the one-dimensional quadratic equation in the mid-term examination questions is brilliant. First, the design of a quadratic equation with implied conditions problem to solve this problem should pay attention to: 1. When using discriminants can not ignore the implicit coefficient of the second term coefficient is not zero; 2. Can not be ignored when using the Vedic theorem Secondary items