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在学习分式时,会遇到一些结构相似的问题,但它们的答案却截然不同.为此,我们要运用分式的基本概念去辨别题目特征,找出恰当的解题方法,以杜绝错误.一、用分式定义辨别分式例1(x~2)/x和(x~2)/π是否均为分式?为什么?解析:(x~2)/x是分式,因为分母中含字母x.但(x~2)/π不是分式,因分母中的π表示的是一个常数,而不是所谓的“字母”.
When we learn fractional formulas, we encounter some problems with similar structures, but their answers are very different. Therefore, we must use the basic concepts of fractional formulas to identify the characteristics of the topics and find the proper solution to the problem so as to prevent errors First, the use of fractional definition of discrimination Fractional example 1 (x ~ 2) / x and (x ~ 2) / π are fractional? Why? Analysis: (x ~ 2) / x is the fractional, because the denominator Contains the letter x, but (x ~ 2) / π is not a fraction because pi in the denominator is a constant, not a so-called “letter”.