实数是初中数学的基础内容．近年来,有关实数知识的开放性试题时常在中考中出现,它们起点适中,形式新颖,视点独特,较好地考查了学生的数感．解答有关实数的开放性试题,既要考虑结果的不确定性,又要活用实数的有关概念和性质．下面结合相关中考试题加以说明． Real number is the basic content of junior high school mathematics. In recent years, open questions on real number knowledge have often appeared in the middle school exams. They have a modest starting point, a novel style, and unique viewpoints. They have better examined the students’ sense of number. To answer open questions about real numbers, it is necessary to consider the uncertainty of the results, but also to use the concepts and properties of real numbers. The following combined with the relevant examination questions to explain.