Question

Ajutati-ma va rog frumos !!! :))

Answer 1

$\displaystyle \frac{1}{7+4 \sqrt{3} } + \frac{1}{7-4 \sqrt{3} } = \frac{7-4 \sqrt{3} +7+4 \sqrt{3} }{(7+4 \sqrt{3} )(7-4 \sqrt{3}) } = \frac{14}{49-48} = \frac{14}{1} =14$