怎样建立函数关系式?这是研究有关函数的应用问题时,首先要碰到的问题。笔者在教学中对建立函数关系式的方法,进行了探索,写出来,请同志们指正。一、利用实际问题中变量之间自然存在着的基本初等函数关系,直接建立函数关系式。例1.一机械机构,如图所示。今知主动杆OA绕点O旋转,转动角速度为ω。被动杆AB在滑块A内滑动,其摆动角为B,试求被动杆摆动角β随主动杆转 How to establish a functional relationship? This is the first problem to be encountered when studying the application of a function. In the teaching, the author explored the method of establishing a functional relationship and wrote it out, asking the comrades to correct me. First, use the basic elementary functional relationship between variables in the actual problem to establish a functional relationship directly. Example 1. A mechanical mechanism as shown. Now that the active rod OA rotates around the point O, the rotational angular velocity is ω. The passive rod AB slides in the slider A, and its swing angle is B. Try to find the passive swing angle β with the active rod