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a]$\frac{2007}{2008}$ =1-$\frac{1}{2008}$
$\frac{2009}{2010}$ =1-$\frac{1}{2010}$
Mà $\frac{1}{2008}$ >$\frac{1}{2010}$
⇒1-$\frac{1}{2008}$ $\frac{1}{5}$
⇒$\frac{17}{68}$>$\frac{1}{5}$