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抽象函数是指只给出一些体现函数特征的式子,而没有给出具体解析式的函数.虽然不知道其函数解析式,但由题意可探求其局部性质或图象的局部特征,从而解决有关问题.
The abstract function refers only to formulae that express the characteristics of the function, but does not give the function of the specific analytical formula. Although the function analytical formula is not known, the local meaning of the function or the local characteristics of the image can be searched by the meaning of the question. Solve the problem.