同方程一样,函数也是分析和解决问题的一种很有用的数学工具.笔者最近去了一趟美国,了解了那里中学的一些情况.在美国中学数学课本中,一次函数的应用题涉及到了日常生产、生活的方方面面,充分体现了数学来源于生活、应用于生活的理念.现摘选几例,供大家参考.例1爱伦在医生的指导下,进行科学减肥.减肥15天后,她的体重为176磅;减肥45天后,体重为170磅. Like equations, functions are also a useful mathematical tool for analyzing and solving problems. The author recently went to the United States to learn some of the conditions of high schools there. In the American high school math textbooks, the application of a function relates to the daily Production, all aspects of life, fully embodies the concept of mathematics from life, applied to life.Now choose a few cases for your reference.Example 1 Ellen, under the guidance of a doctor, to carry out scientific weight loss.Still 15 days after her Weighing 176 pounds; after 45 days of weight loss, weighed 170 pounds.