大家都习惯地把分数(百分数)应用题分为三类: (一)求一个数是另一个数的几分之几(或百分之几); (二)求一个数的几分之几(或百分之几)是多少; (三)已知一个数的几分之几(或百分之几)是多少,求这个数。每类基本题只要改变关键性的一两个字,就会成为它的发展题;(二)、(三)两类题的陈述又很相似, Everyone is accustomed to the application of the scores (percentage) is divided into three categories: (a) to find a number of another number of a few (or a few percent); (b) Find a few a few (Or what percentage) is it? (3) What is the fraction (or what percentage) of a given number and how many? As long as each basic type of question changes one or two of the key words, it will become its development question; (II) and (III) The statements of the two kinds of questions are very similar,