研究一个陌生函数性质的方法主要有三种:一是按照如下顺序逐步研究:定义域、值域、奇偶性、对称性(即广义奇偶性)、周期性、单调性、(图象)凸凹性、关键点、渐近线等(或是通过以上程序的研究再结合最基本的作图方法——列表描点法作出函数的图象,从直观形象与运动变化的角度加 There are three main methods for studying the properties of an unfamiliar function: First, it is studied step by step in the following order: domain, range, parity, symmetry (ie, generalized parity), periodicity, monotonicity, (image) convexity and concavity, Keypoints, asymptotes, etc. (or the combination of the above-mentioned procedures and the most basic method of mapping—the function of the list-mapping method to make a function, plus the change from the visual image and the movement