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1、{1/[n(n+1)]}的前n項和; 2、{1/(n²;-1)}前n項和; 3、{1/[n(n+2)]}的前n項和. 注:第一個是最簡單的裂項求和,第二個需要分拆,第三個既要分拆又剩下的首尾各兩項.
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