代数式是整个数学体系中的一块基石.它能简明地反映数量之间的关系,是今后学习方程和不等式的基础.在列代数式时要注意以下两个方面. 一、抓住关键词语列代数式反映运算关系的词语有多、少、大、小、倍、分、和、差、商、积、平方、立方等.列代数式时只要弄清这些词语所反映的运算关系,理清运算顺序,就能准确地列出相关代数式. The algebraic formula is a cornerstone of the whole mathematics system. It can concisely reflect the relationship between numbers, and is the basis for learning equations and inequalities in the future. When listing algebraic expressions, it is necessary to pay attention to the following two aspects. I. Grasp the algebraic expression of keyword phrases. The words of the operational relationship include more, fewer, greater, smaller, multiple, minute, sum, difference, quotient, product, square, cubic, etc. When you list algebraic expressions, you only need to understand the operational relationships reflected by these words and clarify the order of operations. Can accurately list related algebraic formulas.