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行測啊…… 考慮分母的特徵,(2n+1)^2-1=[(2n+1)-1][(2n+1)+1)]=4n(n+1) 而1/n(n+1)=1/n-1/(n+1) 各項裂項後,可以解出最後結果為n/4(n+1).
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