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在学习二次函数的过程中,我们经常会遇到这样一类问题,一是由二次函数y=ax~2+bx+c(c≠0)的图象特征确定a、b、c之间的关系;二是由a、b、c之间的关系寻找图象的特征.此类试题有利于考查同学们的数形结合能力,开发创新思维能力,提高思维的灵活性.下面举例分析,相信同学们一定会从中受到有益的启示,提高解题技能与技巧.例l为了备战奥运会,中国足球队在某次训练中,一名队员在距球门12m远处劲射,正好击中了2.4m高的球
In the process of learning quadratic functions, we often encounter such a problem, one is to determine the features of a, b, c from the image features of the quadratic function y = ax ~ 2 + bx + c (c ≠ 0) The relationship between the two is to find the characteristics of the image by the relationship between a, b, c, such questions is conducive to test the number of students with the ability to combine the development of innovative thinking ability and improve the flexibility of thinking. , I believe the students will certainly be useful enlightenment to improve the skills and skills to solve problems.For example, in order to prepare for the Olympic Games, the Chinese football team in a training session, a player shot 12m away from the goal, just hit 2.4m high ball