3. Сократите дробь: a)√3-3/√5-√15; 6)a-2√a/3√a-6

3. Сократите дробь:

a) $$\frac{\sqrt{3}-3}{\sqrt{5}-\sqrt{15}}=\frac{\sqrt{3}(1-\sqrt{3})}{\sqrt{5}(1-\sqrt{3})}=\frac{\sqrt{3}}{\sqrt{5}}=\frac{\sqrt{15}}{5}$$

Ответ:$$\frac{\sqrt{15}}{5}$$

б) $$\frac{a-2\sqrt{a}}{3\sqrt{a}-6}=\frac{\sqrt{a}(\sqrt{a}-2)}{3(\sqrt{a}-2)}=\frac{\sqrt{a}}{3}$$

Ответ:$$\frac{\sqrt{a}}{3}$$