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教学目标:1.学生通过观察函数图像,了解到图像蕴涵的信息;2.学生能运用待定系数法、实际模型法求函数表达式;3.学生在经历用一次函数解决问题中增强应用意识,提高实践能力,并逐步加深对函数思想的理解.教学重点:1.从函数图像中获取信息,能看到图像所蕴涵的实际意义;2.通过确定函数表达式解决问题.教学难点:对实际模型法列函数表达式的理解.
Teaching objectives: 1. Students through the observation of function images, to understand the image contains the information; 2. Students can use the method of undetermined coefficient, the actual model method to find the function expression; 3. Students experience using a function to solve the problem to enhance the sense of application, Improve practical ability, and gradually deepen the understanding of the function of thought.Teaching focus: 1.From the function image to obtain information, can see the image implies the actual meaning; 2The problem is solved by determining the function expression .Difficult teaching: the actual Comprehension of model method column function expression.