V
vida123


GIAI GIUM DI
[tex]\frac{a}{b}=\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...............................+\frac{1}{2012^2}[/tex]
so sanh [tex]\frac{a}{b}[/tex] voi 1
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