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函数思想和方程思想是数列的两大精髓.“从基本量出发,知三求二.”这是方程思想的体现.而“将数列看成一种特殊的函数,等差、等比数列的通项公式和前n项和公式都是关于n的函数.”则蕴含了函数思想.借助有关函
The idea of function and the idea of the equation are the two essences of the sequence. “” Starting from the basic quantity, we know that the equation is the expression of the equation, “while” treating the sequence as a special function, The general formula of the series and the first n terms and formulas are all about the function of n. "This implies the function idea.