E(100)=1/199+1/197+1/197+.....+1/3+1=3.27869....
回答: IF E(1)=1, then E(n+1)=E(n)+1/(2n+1), So E(100)=1/199+1/197+1/19
由 jinjing
于 2012-08-10 13:51:59
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