Question

9−3√​5​​​​​ / (√​3​​​−√​15​​​)​^2​​

Answer 1

(9-3√5)/(√3-√15)²=
3(3-√5)/(3-2√45+15)=
3(3-√5)/(18-6√5)=3(3√5)/6(3-√5)=
3/6=1/2

Answer 2

$frac{9-3sqrt{5}}{(sqrt{3}-sqrt{15})^{2}} = frac{3(3-sqrt{5})}{3-2sqrt{3*15}+15} =frac{3(3-sqrt{5})}{18-6sqrt{5}} = frac{3(3-sqrt{5})}{6(3-sqrt{5})} = frac{1}{2}$

Ответ: 0,5.