Question

$-\sqrt{2 \frac{7}{9} } =?$

Answer 1

-$\sqrt \frac{25}{9}$ 

25 si 9 sunt patrate perfecte,deaceea le scoatem de sub radical:
 
$- \frac{5}{3}$

Answer 2

$- \sqrt{2 \frac{7}{9} }=- \sqrt{ \frac{2*9+7}{9} }= -\sqrt{ \frac{25}{9} } =- \frac{5}{3}$
sper ca te-am ajutat