根据同类项的意义，判断同类项的标准有两条：一是所含字母相同，二是相同字母的次数也分别相同．从这两条标准中可以看出，同类项与系数无关．在学习同类项的定义时，同学们并不感到困难，但缺乏应用同类项的定义去解决一些实际问题的意识和能力．现举几例说明如何利用同类项 According to the meaning of similar items, there are two criteria for judging similar items: one is that the letters are the same, and the other is the same number of letters. From these two criteria, it can be seen that the same kind of item has nothing to do with the coefficient. While studying the definition of similar items, the students did not feel any difficulty, but they lacked the awareness and ability to apply the definition of similar items to solve some practical problems. Here are a few examples of how to use similar items