函数思想是中学数学的重要思想方法之一有些数学问题，若能根据有关题设条件和结论中的信息，构造出适当的函数，常可使问题顺利获解．这里略举几例，谈谈构造二发函数处理有关不等问题．例1。、尸、y为8意三角形的三个内角，对于任意实数工、y、y，来证：Z‘十／十Z’＞Zxycos Function idea is one of the important thought methods of middle school mathematics. There are some mathematics problems. If we can construct appropriate functions according to the information in the conditions and conclusions of relevant questions, we can often solve the problem successfully. Here are a few examples to talk about constructing second function to deal with unequal problems. example 1. The corpse, y, and y are the three interior angles of the eight-pointed triangle. For any arbitrary number of workers, y, y, to prove: Z ‘10/Z>Z’>Zxycos