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求二次函数的解析式是初中代数的重点与难点 ,这类题涉及面广 ,灵活性大 ,综合性强 ;也是解决相关函数问题的关键 .本文以中考题为例 ,介绍二次函数解析式的求解思路 .1 掌握三种基本形式1 .1 当已知二次函数图象上的三个点 ,可设其解析式为一般式y=ax2 +bx+c(a≠ 0 ) ;例 1
Solving the analytic function of quadratic function is the key and difficult point of junior high school algebra. This type of problem involves a wide range, flexibility, and comprehensiveness; it is also the key to solving the problem of related functions. This paper uses the exam questions as an example to introduce the quadratic function analysis. The solution of the formula. 1 grasp the three basic forms 1.1 When the three points on the image of the known quadratic function, you can set its analytical formula to the general formula y = ax2 + bx + c (a ≠ 0); 1