“合并同类项”是人教版义务教育课程标准实验教科书《数学》七年级上册第二章“整式的加减”第2节“整式的加减”第一课时的内容,是本章的一个重点,其运算法则的应用是整式加减运算的基础,是学习下一章“一元一次方程”的基础,也是今后学习整式的乘除、因式分解、解不等式 “Merger of similar items ” is the People’s Education Edition compulsory education curriculum standard experimental textbook “Mathematics” seventh grade on the second chapter “integral addition and subtraction ” Section 2 “integral addition ” content of the first class Is a key point in this chapter. The application of its algorithm is the basis of the whole addition and subtraction operation. It is the basis for learning the next chapter of “one dollar and one degree equation.” It is also the multiplication and division of learning integral, the factorization and the inequality