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读书是学习,使用也是学习,而且比读书更重要。理论与实际的结合是学好数学的重要方法之一。下面就用二次函数模型例析运动问题。题目来源:最新九年级教材。题目:汽车刹车过程中,行驶的路程是s,刹车时间是t刹车时间与行驶的路程s的关系满足二次函数s=15t-6t2,求刹车的最大距离。本题对九年级学生来说,确实是一道难题,要解决刹车的最大距离,那么刹车用了多长时间呢?首先我们来研究二次函数y=15x-6x2。对于这个
Reading is learning, use is learning, and more important than reading. The combination of theory and practice is one of the important ways to learn mathematics well. The following quadratic function model analysis of motion problems. Topic Source: The latest ninth grade textbook. Title: Braking process, the driving distance is s, the braking time is t The relationship between braking time and driving distance s satisfy the quadratic function s = 15t-6t2, find the maximum distance of the brake. This question for ninth graders, is indeed a problem, to solve the maximum braking distance, then how long the brake used? First of all, we study the quadratic function y = 15x-6x2. For this