参数,在解题中作为沟通已知与未知的纽带,常常发挥着重要作用,根据题目的结构特征灵活设参数介入解题,往往能使看似复杂或难以求解的问题,巧妙获解,应注意掌握,并注意以下三点:1.注意树立设参数的意识,解题需要时能随时想到;2.认识参数的作用,即用参数表示变量,减少变量的个数; As a link between the known and the unknown, the parameter often plays an important role in solving the problem. According to the structural features of the topic, setting the parameters flexibly and intervene to solve the problem often can make the seemingly complicated or difficult to solve the problem cleverly and should Pay attention to the master, and pay attention to the following three points: 1. Attention to establish the awareness of the parameter set, problem solving can be thought of anytime; 2. Recognize the role of parameters, that is, variables with variables that reduce the number of variables;