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因函数概念的抽象性,再加上函数的性质是用函数的图像来说明的,所以学生对函数图像与性质的理解比较困难。相对于一次函数和反比例函数,二次函数的情况更为复杂多变。如何引导学生正确认识二次函数,提高二次函数学习的效率?笔者在教学实践中用四句“口诀”做总结,并以此引导学生学习二次函数,取得了很好的教学效果。这四句话是:“五点三式四符号,图像变换三关系,对称增减两性质,图像性质
Due to the abstraction of the concept of function, coupled with the nature of the function is the image of the function to illustrate, so students understand the function of the image and the nature of more difficult. Compared with the first order function and the inverse function, the quadratic function is more complex and changeable. How to Guide Students to Understand Quadratic Function Correctly and Improve the Efficiency of Quadratic Function Learning? In the teaching practice, the author concludes with ”Quotations “ in four sentences and guides students to learn quadratic functions so as to obtain good teaching results . These four sentences are: ”Five-point four-symbol, three-dimensional image transformation, symmetric increase and decrease of two properties, the nature of the image