已知一个不等式(组),按照常规步骤很容易求得其解集或特殊解.若已知一个不等式(组)的解集或特殊解情况,要确定其中所含参数的值或取值范围,常令一些同学头疼,疑惑重重.下面请张老师介绍几例,同学们要细心体会“咬住”解集,“握紧”数轴,“破解”参数的途径和方法.一、已知不等式的解集中特殊解情况, Knowing an inequality (group), it is easy to find its solution set or special solution according to the conventional procedure. If the solution set or special solution of an inequality (group) is known, the value or range of the parameters contained in it must be determined. Some classmates often suffer from headaches and confusion. Below, please introduce some examples to Mr. Zhang. Students should carefully understand the ways to “grasp” the solution set, “clench” the number axis, and “crack” the parameters. First, the special solution of the solutions of known inequalities,