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图象法是表示函数关系的重要方法之一,函数图象有着很大的实用价值,在科学与技术的研究中,广泛地应用它来直接考察变量的变化情况,因此寻找它们的变化规律是很有必要的.在研究用解析式表示的函数时,同时绘制出函数的图象,对于研究工作,也能起重要的辅助作用,利用图象的直观性,把从函数特性的探讨中所获得的结果,利用图象明显地表达出来;还可以先用描点法做出函数的粗略图象,观察函数可能具有的特性,给函数的讨论提供线索.
Image law is one of the most important ways to represent the function. The function image has great practical value. In the research of science and technology, it is widely used to directly examine the change of variables. Therefore, the law of looking for them is It is necessary to study the function expressed by the analytic function at the same time to draw the function of the image for the research work can also play an important auxiliary role in the use of the intuitive image to explore the characteristics of the function The results obtained are clearly expressed in terms of images. It is also possible to sketch the rough sketch of a function first, observe the possible features of the function, and provide clues to the discussion of the function.