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一次函数应用问题是初中数学的重点内容,能较好地考察学生的阅读理解能力与日常生活体验,同时又考察学生获取信息后的抽象概括能力、建模能力和判断决策能力,强化学生的“用”数学意识,因而成为近年来全国各地中考命题的热点,现举例加以说明.一、图象类例1小刚家与学校相距1000米.某天小刚上学时忘了带一本书,走了一段时间才想起,于是返回家拿书,然后加快速度赶到学校.下图是小刚与家的距离(米)关于时间(分钟)的函数图象.请你根据图象
The application of primary function is the key content of junior high school mathematics, which can better examine students ’reading comprehension ability and daily life experience. At the same time, it also examines students’ abstract abilities, modeling ability and decision-making ability after acquiring information, “With ” mathematics awareness, and thus become a hot topic in recent years throughout the country in the test, are examples to illustrate.One, image example 1 Xiaogang and the school 1000 meters apart one day Xiaogang forget to bring a Book, take a while to think of it, so go home to get the book, and then speed up to school. The following is the distance between Xiaogang and the house (m) function image about time (minutes)