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用待定系数法求二次函数的表达式是二次函数这一章的重点,也是难点,同学们在学习过程中经常被二次函数不同的表达式,图像不同的位置所迷惑,找不到解题的诀窍,于是钻进题海而苦不堪言.解题的关键是理解函数概念,运用数形结合思想,巧妙借助函数的特殊位置,灵活运用不同表达式解题,从而达到掌握一题,会解一类.一、基本题目例1已知二次函数y=ax2的图像经
Using undetermined coefficient method to find the expression of quadratic function is the focus of the chapter of the quadratic function, but also difficult, students are often confused by the expression of different quadratic functions in the learning process, the location of the image can not be found Problem-solving trick, so drilling into the sea and miserable.The key to solving the problem is to understand the concept of function, the use of numerical combination of ideas, clever use of the special position of the function, flexible use of different expressions to solve problems, so as to achieve a problem , Will solve a class.First, the basic problem Example 1 known quadratic function y = ax2 image by