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问怎样正确理解同类项的概念？答所含字母相同，并且相同字母的次数也分别相同的项叫做同类项．理解这一概念要抓住3点：（1）同类项概念是在对单项式进行比较的情况下建立的，单独一项就不能说是不是同类项；（2）同类项必须满足“两同”：①所含字母相同；②相同字母的次数相
Ask how to correctly understand the concept of similar items? Answers containing the same letters and the same number of letters are called items of the same type. To understand this concept, we must seize the following three points: (1) The concept of homogeneous items is established in the case of comparison of single items, and a single item cannot be said to be the same type of item; (2) The same item must satisfy the “two-simultaneous”. : 1 contains the same letter; 2 times the same letter