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Member Since 12-03-2015
Offline Last Active 29-08-2015 - 21:34

12-03-2015 - 10:36

Tính $S= \frac{1}{2!}+\frac{2}{3!}+\frac{3}{4!}+...+\frac{n}{(n+1)!)}$

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TranTheHai2000