一、深刻认识用字母表示数的思想方法用字母表示数不仅将一些基本的数量或数量关系简明地表示出来,而且还给公式与方程的运算带来方便.因此用字母表示数是代数式的一个重要特点,也是学习代数的一种重要思想方法. First, a deep understanding of the idea of ​​using letters to represent the number of ways to represent the number of letters not only a simple representation of the number of basic quantitative or quantitative relations, but also to facilitate the operation of formulas and equations. Therefore, the number of letters is algebraic one The important feature is also an important way of thinking in studying algebra.