Respostas

2014-04-20T18:29:07-03:00
 \frac{1}{( \sqrt{2}+1 )} + \frac{1}{( \sqrt{2}-1 )}

Multiplicando cada parcela pelo conjugado


 \frac{1}{( \sqrt{2}+1 )}. \frac{(\sqrt2-1)}{(\sqrt2-1)}  + \frac{1}{( \sqrt{2}-1 )} . \frac{(\sqrt2+1)}{(\sqrt2+1)}

 \frac{ \sqrt{2} -1}{2-1} + \frac{\sqrt2+1}{2-1}

 \sqrt{2} -1+ \sqrt{2}+1

\boxed{\boxed{2 \sqrt{2} }}

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