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充分必要条件的判断是高考考查的重要内容之一,由于概念抽象且不易理解,也是易出错的内容之一.下面通过举例,谈谈充分必要条件的判断方法.
The judgment of the necessary and sufficient condition is one of the important contents of the college entrance examination examination, which is also one of the error-prone contents due to the abstract concepts and is not easy to understand .Through an example, to talk about the judgment method of the necessary and sufficient conditions.