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所谓抽象函数问题是指没有具体地给出函数的解析式,只给出它的一些特征或性质.这类问题的解法常涉及到函数的概念和各种性质,因而具有
The so-called abstract function problem means that the analytical formula of the function is not given concretely, and only some of its features or properties are given. The solution of such problems often involves the concept and various properties of the function, and thus has