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合并同类项是《字母表示数》一章中的重要内容,也是整式加减的基础,要学好它必须注意以下几个方面的内容:一、深刻理解同类项的概念含有相同字母,并且相同字母的次数也相同的项。叫做同类项.几个常数项也是同类项.对于其概念要从以下三个方面去理解:1.同类项必须具备两个条件即两个相同:(1)含有相同字母;(2)相同字母的次数相同,二者缺一不可.
Combining similar items is an important part of the “letter representation number” chapter. It is also the basis for additions and subtractions of the whole formula. To learn it well, it is necessary to pay attention to the following aspects: 1. The concept of understanding similar items has the same letter and the same letters. The same number of items. Is called the same type of items. Several constant items are also similar items. For the concept to understand from the following three aspects: 1. The same type of item must have two conditions that are the same two: (1) contains the same letter; (2) the same letter The same number of times, both are indispensable.