不久前 ,[1]曾谈及这样一类题目 :已知命题“方程X(或不等式X)的解集是X” ,求这一命题的否定 .由于这一类题目当前仍可见于某些复习资料 ,而且数量虽少 ,给学生们和任课教师们带来的问题却很多 ,本文拟对之略表拙见 .1　就 [1]所举之例谈这类题目应有的解法和答案例　求命题“ Not long ago, [1] had talked about such a topic: The known proposition “The solution set of equation X (or inequality X) is X”, for the negation of this proposition. Since this type of topic is still visible in certain Reviewing materials, and the number is small, brings a lot of problems to students and teachers. This article is intended to provide a brief overview of them.1. Examples of solutions and answers to these topics should be given in [1]. Seeking Proposition "