1: \(=\dfrac{\sqrt{15}\left(\sqrt{3}-\sqrt{5}\right)}{\sqrt{3}\left(\sqrt{3}-\sqrt{5}\right)}=\dfrac{\sqrt{15}}{\sqrt{3}}=\sqrt{5}\)
2: \(=\dfrac{\sqrt{30}\left(\sqrt{5}-\sqrt{6}\right)}{\sqrt{10}\left(\sqrt{6}-\sqrt{5}\right)}=-\sqrt{\dfrac{30}{10}}=-\sqrt{3}\)