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整式的加减运算在初中数学教学中属于难点,由于其涵盖了代数运算法则及有理数加法运算的知识,使得学生们在初学时颇感压力。经过长期的教学研究我们发现,虽然整式的加减运算题目表现形式复杂,设问的方式多样,但是其考查的目的极为明确,应对题目的策略也较为固定。剖析整式运算的计算过程可知,在整式拆分、合并、运算的过程中,整式运算的重点在于合并同类项。因此,若想帮助学生攻克整式运算的难关,对于同类项合并的点拨显得格外的重要。
The whole addition and subtraction operations are difficult in junior high school mathematics teaching. Because they cover the knowledge of algebraic algorithms and rational numbers addition operations, students are quite stressed when they begin their studies. After long-term teaching and research, we found that while the overall addition and subtraction operations are complicated in terms of presentation form and diverse ways of questioning, the purpose of examination is extremely clear and the strategies for dealing with the questions are relatively fixed. Analysis of the calculation of integer computing shows that in the whole split, merger, computing process, the integer computing focus is to merge the same items. Therefore, if you want to help students overcome the difficulties of the integer computing, it is particularly important for the same type of merger.