对于许多复杂问题,可以通过对题目条件、结论的结构特征进行观察、对照、分析,从而提炼出新的模型加以解决,这类题目往往以构思新颖、方法便捷而倍受命题者青睐,同时也是训练数学创造性思维的有效途径,因而成为考试的热点.下面我们以构造二次函数解题为例,探究其解法. For many complex problems, we can solve these problems by observing, comparing and analyzing the structural conditions of the topic conditions and conclusions so as to extract new models. Such topics are often favored by well-thought-out and easy-to-use methods, and are also Training an effective way to creative thinking in mathematics, and thus become a hot exam.Next, we construct the quadratic function to solve the problem, for example, to explore its solution.