《代数初步知识》作为初中学习的开端 ,其承前启后的作用不必赘言 .从算术到代数的过渡 ,其主要标志是字母代替数 ,实现的是学生认知上的质的飞跃 .通过本章的学习 ,不仅可以弥补小学学习的不足与认知上的空白 ,更重要的是本章“统帅”作用的发挥 ,列代数式直接影响着代数的全 “Algebraic preliminary knowledge” as the beginning of junior high school learning, it does not have to be rumored that the role of inheritance from the past. The main symbol of the transition from arithmetic to algebra, the letter instead of the number, to achieve a qualitative leap in student cognition. Through the study of this chapter, Not only can we make up for the lack of primary school learning and the gap in our understanding. What is more important is the role played by the “commander” in this chapter. The algebraic formula directly affects the whole of algebra.