(n+1)/2n
1-1/n²=(1+1/n)(1-1/n)
运用公式法(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/n²)
运用公式法(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/n²)
数学人气:535 ℃时间:2020-01-28 13:19:16
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