我们知道,在整式的加减运算中,有一个很重要的步骤是合并同类项,学好同类项是学好整式加减的关键.那么如何学好同类项呢?下面我们就从同类项的概念入手,逐步认识它. We know that in the addition and subtraction of integers, there is a very important step to merge similar items. Learning the same kind of items is the key to learning how to learn the same type of addition and subtraction. Then we start with the concept of similar items. Gradually recognize it.