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近年来,含有参变数的各种问题,逐渐成为中学数学界的一个热点。追其原因,一是参变数问题本身的特点,题材广泛,较易编制。二是概括性强,解决这种问题不仅要求学生对基础知识充分理解,并要求学生的思维能力达到一定的水平,这一般是不能靠题海战术可奏效的,三是符合中学数学要求。因此,参变数问题有时出现在正规的考试中,或出现在高考试卷中(作为中、高档题)是很自然的。
In recent years, various issues involving parametric variables have gradually become a hot topic in the middle school mathematics community. The reason for chasing it is that the first problem is the nature of the problem of the number of variables, the subject matter is extensive, and it is easier to compile. The second is that the generality is strong. Solving this kind of problem not only requires the students to fully understand the basic knowledge, but also requires the students’ thinking ability to reach a certain level. This generally cannot rely on the sea tactics to be effective, and the third is to meet the mathematics requirements of the middle school. Therefore, it is natural that the issue of parametric variables sometimes appears in formal examinations or in high exam volumes (as middle and high-grade questions).