作函数的图象常用两种方法: 1.描点法:此法适用于任何函数. 2.图象变换法:前提是有一个已知的起点函数,然后对起点函数的图象进行平移、翻折(或对称)、伸缩等变换,此法对于某些较复杂函数的处理显得力不从心. 特征分析法区别于以上两种方法,它需要对函数的特征进行代数分析:定义域、值域、单调性、 There are two methods for making a function image: 1. Sketch method: This method is applicable to any function. 2. Image transformation method: The premise is that there is a known starting point function, and then the image of the starting function is translated and flipped. Such methods as folding (or symmetry) and expansion and contraction are not suitable for the processing of some more complex functions. The feature analysis method is different from the above two methods in that it needs to perform algebraic analysis on the features of the function: domain, range, monotony Sex,