H
hongdoan


tinh hop li:
cho [tex]\frac{4}{1*5}+\frac{4}{5*9}+..........+\frac{4}{2001*2005}[/tex]
(dau "." la nhan;"*"la phan)
:-*
| |-)
cho [tex]\frac{4}{1*5}+\frac{4}{5*9}+..........+\frac{4}{2001*2005}[/tex]
(dau "." la nhan;"*"la phan)
:-*
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