函数与导数部分是高中数学的重点和难点,在历次的高考中都占据着重要的地位,而且这部分知识既有选择也有填空题还有较难的解答题目。函数贯穿着高中数学的始终,因此学好这部分知识对学生来说很重要。但这部分知识又有很多易错点,特别是求函数解析式抽象函数的定义域以及函数的周期性对称性, Function and derivative part are the key points and difficulties of high school mathematics. They occupy an important position in all college entrance examinations. Moreover, this part of knowledge has both the choice and the blank answer as well as the difficult answers. Function throughout the high school mathematics, so learn this part of the knowledge is very important for students. However, this part of the knowledge has a lot of error-prone points, especially the domain of the abstract function of function-solving and the periodic symmetry of the function,