“已知三点确定二次函数解析式”是函数一章的基本题型．若能充分利用转化思想，用“活”这一基本方法，是可以解决许多求二次函数解析式的问题的．本文以部分中考题为例，说明用转化思想巧求二次函数解析式的方法，供同学们学习时参考．例1已知对称轴平行于y轴的抛物线过点卜1 “Knowing three points to determine the analytic function of the quadratic function” is the basic question type of the function chapter. If we can make full use of the idea of ​​transformation, using the basic method of “living” can solve many problems of solving the analytic function of the quadratic function. This article takes part of the exam questions as an example to illustrate how to use the transformation idea to inquire the analytical method of the quadratic function for the reference of the students. Example 1 known parabolic axis parallel to the y-axis parabolic point 1