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数列的通项公式和函数表达式一样,可以由一个表达式给出,也可以分段由几个表达式给出.若已知一个数列的前n项和Sn,则其通项公式为
The general formula of a series is the same as a function expression, which can be given by one expression or by several expressions. If the first n terms and Sn of a series are known, the general formula is