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整式的加减是初中阶段“式”运算的开始,从“数”到“式”,从“数”的运算到“式”的运算,应该是学习数学的一个飞跃,是后续的方程、函数等内容学习的必要准备．在学习“整式的加减”的过程中,最主要的有两点．1．在现实情境中理解用字母表示数的意义,掌握用字母表示数,用一个简洁明了的式子表示实际问题中存在的数量关系,在探索现实世界
The addition and subtraction of the whole formula is the beginning of the “formula” operation in the junior high school. From the “number” to the “formula” and the “number” operation to the “formula” operation, it should be a leap in learning mathematics. It is a follow-up equation and function. The necessary preparation for such content learning. There are two main points in the process of learning the “plus and minus” of the whole formula. 1. Understand the meaning of numbers in letters in real situations, master numbers in letters, and use a simple and concise formula to represent quantitative relationships in practical problems and explore the real world.