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数列——自变量取自然数时的函数,导数——研究函数的有力工具.因此构造函数,利用导数研究函数的性质,进而研究数列的有关问题.
Sequences—functions and derivatives when the natural variable is taken as an independent variable—a powerful tool for studying the function. Therefore, we use the derivative to study the function’s properties and then study the related problems of the sequence.