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二次函数有丰富的内涵和外延,深入研究可以建立起函数、方程、不等式之间的联系,可以编拟出灵活多变的数学问题。初中教材对二次函数作了较详细的研究。通过初中阶段的学习,学生对二次函数的定义和图像等相关知识有了初步的认识,但是受其理解能力和接受能力的影响,部分内容的学习是教师灌输机械记忆的,难以从本质上加以理解。进入高中以后,我们非常有必要对二次函数的基本概念和基本性质(图像以及单调性、奇偶性、有界性)等进一步深入学习。
Quadratic functions have rich connotation and denotation, in-depth study can establish the relationship between functions, equations, inequalities, can be prepared flexible mathematical problems. Junior high school teaching materials on the quadratic function made a more detailed study. Through the study of junior middle school, students have a preliminary understanding of the definition of quadratic function and related knowledge such as images. However, influenced by their ability to understand and accept, part of the content is learned by teachers instilling mechanical memory, To understand. After entering high school, it is very necessary for us to further study the basic concepts and basic properties of quadratic functions (images, monotonicity, parity, boundedness).