论文部分内容阅读
二次函数y=ax~2+bx+c(a≠0)在中学代数课程里占有极重要的地位.涉及二次函数的问题是多种多样的,例如求二次函数的解析式,最值问题,函数图象的性质,与一元二次方程ax~2+bx+c=0(a≠o0的实根的存在性和根的性质的关系,与一元二次不等式的解集的关系,等等.如果再与几何问题、三角函数问题等混合在一起,能构成更加丰富多采的综合题.因此,这种综合题就成了历年来各省市中考试题中常见的重要题型.
The quadratic function y=ax~2+bx+c(a≠0) occupies a very important position in the middle school algebra course. The problems involving quadratic functions are various, such as the analytical function of the quadratic function. The value problem, the nature of the function image, and the relationship between the existence of a real root and the property of the root of a one-dimensional quadratic equation ax~2+bx+c=0 (a≠o0), and the solution set of a quadratic inequality , Etc. If you mix with geometric problems, trigonometric problems, etc., you can build a richer and more comprehensive problem. Therefore, this comprehensive problem has become a common important question in the examination questions in various provinces and cities over the years.