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列举,就是把符合条件的情况一一列举出来,对于列举法,不少同学往往“不屑”去用,认为繁琐,没有数学味,其实并非如此,它有独特的价值与魅力。
The enumeration is to enumerate the conditions that meet the conditions. For the enumeration method, many students often “disdain” to use them. They think that they are cumbersome and have no mathematical taste. This is not the case. It has unique values and charms.