分式的基本概念及其性质看似简单,但在一些考试(包括中招考试)中却经常涉及．其主要考查对分式概念的理解、分式有意义的条件、分式值为零的条件、利用分式的基本性质改变分式的形式等．下面就针对以上几种情况,进行简要分析． The basic concept of fractions and its nature seem simple, but it is often involved in some exams (including exams). It mainly examines the understanding of the concept of fractions, the condition of meaningful fractions, the condition that the fractional value is zero, and the use of fractional basic properties to change the form of fractions. Here is a brief analysis of the above situations.