在初中,由于初中生的基础薄弱,又受其接受能力的限制,这部分内容的学习多是机械的,很难从本质上加以理解,进入高中以后,尤其是高三复习阶段,要对他们的基本概念和基本性质(图象以及单调性、奇偶性、有界性)灵活应用,对二次函数还需再深入学习。一、进一步深入理解函数概念进入高中后在学习集合的基础上接着学习函数概念,这时就可以用学生已经有一定了解的函数,特别是二次函数为例来 In junior high schools, because junior high school students have a weak foundation and are restricted by their ability to accept, this part of the learning is mostly mechanical, and it is difficult to understand them in nature. After entering high school, especially during the third grade review stage, it is necessary for them. The basic concepts and basic properties (image and monotonicity, parity, boundedness) are applied flexibly, and further study of quadratic functions is required. First, to further understand the concept of function in high school and then learn the concept of the function based on the learning set, then you can use the students have a certain understanding of the function, especially the quadratic function as an example