函数的图象与性质,既是高考的重点,又是一个难点.中学阶段,我们不仅要求学生掌握一次函数、二次函数、反比例函数、指数函数、对数函数、幂函数等基本初等函数以及三角函数的图象与性质,而且还要求学生能在此基础上,根据奇偶性、单调性、周期性以及对称性,通过平移、对称、翻折等变换,得到一些复杂函数的草图.数形结合思想是一种重要的数学思想,也是解答函数类题目必不可少的工具.很多涉及函数的题目,只要学生能够正确 The image and nature of the function is not only the focus of the college entrance examination, but also a difficult point.Secondary stage, we not only require students to master the basic functions such as primary function, quadratic function, inverse proportion function, exponential function, logarithmic function, power function and triangular Function, but also require students to get some sketches of complex functions based on the parity, monotony, periodicity and symmetry through translation, symmetry, folding and other transformations. Thought is an important mathematical thought, but also an indispensable tool for answering questions about functions.Many topics involving functions, as long as students are able to correct