进入中学，同学们首先要学习列代数式．列代数式是同学们学习《代数》遇到的第一个重点内容，同时也是一个难点．它是今后学习列方程解应用题等知识的基础．要正确、迅速地列出代数式，应注意以下两个方面：一、怎样列代数式代数式就是用基本的运算符号把数或表示数的字母连结 In middle school, students must first learn algebraic expressions. Column algebraic expression is the first important content encountered by the students learning Algebra, but also a difficult point. It is the basis for the future learning of equations and solutions. To correctly and quickly list algebraic expressions, note the following two aspects: First, how to list algebraic algebraic expressions is to use basic arithmetic symbols to connect numbers or letters representing numbers.