二次函数及其根的分布是高考必考内容.笔者认为有两个方面的原因:一是考查二次函数、二次方程、二次不等式的联系及相互配合解题;二是高考在考查这一内容时有其隐蔽性和综合性.高考试题有其固有的综合性,而当我们把一些综合性非常强的题目剥去层层面纱,归根结底,又回到了对二次函数、二次方程、二次不等式的应用,而其中尤为重要的是含参数的二次函数的应用,其中 Quadratic function and its root distribution is the college entrance examination content.I think there are two reasons: one is to examine the quadratic function, the quadratic equation, the second inequality of the relationship and cooperate with the problem-solving; second is the entrance examination in the test This content sometimes has its covert and comprehensive.Examination entrance exam has its inherent synthesis, and when we put some very comprehensive problem stripped layers of veil, after all, returned to the quadratic function, twice Equations, the application of quadratic inequalities, and of particular importance is the application of quadratic functions with parameters, where