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高一代数“二次函数”这一单元里,为了研究一般二次函数y=ax~2+bx+c的图象,课本从函数y=x~2的图象开始,顺序地研究了函数y=ax~2,y=ax~2+c等的图象,最后才得出函数y=ax~2+bx+c的图象和性质。这部分教材,如果按照课本平铺直叙,不分主次,那末在教学中就会造成非常繁琐,使学生感到厌烦。为了提高教学效果,我认为在教学中突出重点,抓住关键是非常重要的事。下面谈谈我在教学这一内容中的一些体会。一、函数y=x~2的图象是教学二次函数图象的基础。在二次函数的图象的研究中,按照课本的内容是以函数y=x~2的图象为基础的,而这样的处理,我认为也是合适的。在函数y=x~2的图象这一节里,我认为主要应解
In the unit of high-order number “quadratic function”, in order to study the image of the general quadratic function y=ax~2+bx+c, the textbook starts from the image of function y=x~2, and the functions are sequentially studied. The image of y=ax~2, y=ax~2+c, etc. Finally, the image and properties of the function y=ax~2+bx+c are obtained. This part of the textbook, if it is flat and straightforward in terms of textbooks, regardless of primary or secondary, then it will be very tedious in teaching and make students bored. In order to improve teaching effectiveness, I think it is very important to focus on the key points in teaching. Let’s talk about some of my experiences in teaching this content. 1. The image of the function y=x~2 is the basis for teaching the quadratic function image. In the study of the image of a quadratic function, the content of the textbook is based on the image of the function y=x~2, and such processing is, I think, appropriate. In the section of the image of function y=x~2, I think that the main solution should be