近几年来中考题中常有形数结合求二次函数解析式的综合题,解这类题需综合应用几何与代数的知识.利用形数结合的方法,可以沟通代数、几何间的联系.拓宽知识面,增强分析问题和综合运用知识的能力,所以应引起同学们的重视.今举例如下.例1 如图1,在△ABC 中,∠A=60°, In recent years, there have been many problems in the intermediate examination questions combined with the quadratic function analytical formula. The solution to this type of problem requires the comprehensive application of geometric and algebraic knowledge. Using the method of combining shapes, you can communicate the connection between algebra and geometry. Broaden your knowledge. In order to enhance the analysis of problems and the ability to comprehensively use knowledge, students should pay attention to it. This example is as follows. Example 1 In Figure 1, in △ABC, ∠A=60°,