№1 Найдите значение выражения

1. $$\sqrt{45} \cdot \sqrt{5} = \sqrt{45 \cdot 5} = \sqrt{225} = 15$$
2. $$\sqrt{160} \cdot \sqrt{250} = \sqrt{160 \cdot 250} = \sqrt{40000} = 200$$
3. $$\frac{\sqrt{108}}{\sqrt{3}} = \sqrt{\frac{108}{3}} = \sqrt{36} = 6$$
4. $$\frac{\sqrt{90}}{\sqrt{0.016}} = \sqrt{\frac{90}{0.016}} = \sqrt{5625} = 75$$