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教学目标:(1)理解函数的单调性的概念;(2)能判别或证明一些简单函数的单调性;(3)学会理性地认识与描述生活中的增长递减等现象,体会数形结合思想。重难点:用图象直观地认识函数的单调性,并利用函数的单调性求函数的值域。教学过程:一、认识函数的一种性质材料:观察某市一天24小时的气温变化图,回答下列问题:问题1.说出气温在哪些时段内是逐步升高的?哪些时
Teaching objectives: (1) to understand the concept of monotonicity of functions; (2) to discriminate or prove the monotony of some simple functions; (3) to learn to reasonably recognize and describe the phenomenon of diminishing growth in life, . Heavy and difficult: the image intuitive understanding of the monotonicity of the function, and use the monotonicity of the function to find the value range. Teaching process: First, a nature of understanding of the function Material: observe a city 24 hours a day temperature changes in the map, answer the following questions: Question 1. Say the temperature is gradually increased in what time?