Question

La ex: 9 . va rog.................

Answer 1

$\sqrt{ \frac{169}{81} } = \sqrt({ \frac{13}{9} })^{2} = \frac{13}{9} = 1.(4)$
$\sqrt{1 \frac{7}{9} } = \sqrt{ \frac{16}{9} } = \sqrt{ (\frac{4}{3} }) ^{2 } = \frac{4}{3} = 1.(3)$