一、关于分式概念一般地 ,形如 AB的式子叫做分式 ,其中 A和 B均为整式 ,且B中含有字母。1 .除式 B中必须含有字母。有理式中按除式里是否含有字母分为两类 :除式中不含有字母的有理式是整式 ;除式里含有字母的有理式是分式。所以除式中是否含有字母是整式与分式的根本区别。例 First, on the concept of fractional, generally, the formula of AB is called a fraction, where A and B are integral, and B contains letters. 1. Divide B must contain letters. There are two types of letter in the rational formula according to whether there are letters in the division: In addition to the letter, the rational formula without the letter is the whole formula; the rational formula with the letter in the division formula is the fraction. So whether or not the letter contains the letter is the fundamental difference between the whole formula and the fraction. example