已知不等式(组)的解集,求不等式(组)中参数的取值,是一类有较强灵活性的问题.近年来,各地中考试卷上经常涉及这类问题.多数同学 Knowing the solution sets of inequalities (groups) and finding the values ​​of the parameters in inequalities (groups) is a type of problem that has a high degree of flexibility. In recent years, these types of questions have often been involved in local examination papers.