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求数列的和是中学数学的一项重要内容,常见的有两种方法——拆项法、作辅助数列法。使用拆项法求数列前几项的和的关键,是把通项拆成两个或两个以上的项的和、差,得到能直接用公式求和的新数列,从而求得原
Sum of summation is an important part of high school mathematics. There are two common methods - disassembling method and auxiliary sequence method. The key to using the disaggregation method to sum the first few items is to split the items into two or more terms and subtract them from the new ones that can be directly summed using the formula