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函数的概念是基本的数学概念之一,它贯穿于初等数学及高等数学的大部分领域,初等函数的相关内容是中学数学的核心内容,也是联系中学数学各部分内容的主线,复习好函数是复习好中学数学的关键.
The concept of function is one of the basic mathematical concepts. It runs through most fields of elementary mathematics and higher mathematics. The content of elementary functions is the core content of middle school mathematics, and it is also the main line linking the contents of various parts of middle school mathematics. Review the key to high school mathematics.