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1/1x3+1/3x5 +1/(2n-1)(2n+2)=n/2n+1
人气:308 ℃ 时间:2020-07-19 21:21:19
解答
1/1x3+1/3x5 +1/(2n-1)(2n+2)
=½[1-1/3+1/3-1/5+······+1/(2n-1)-1/(2n+1)]
=½(2n)/(2n+1)
=n/(2n+1)
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