3: \(=\dfrac{\sqrt{5}+1}{\sqrt{5}-1}+\dfrac{\sqrt{5}-1}{\sqrt{5}+1}\)
\(=\dfrac{6+2\sqrt{5}+6-2\sqrt{5}}{4}=\dfrac{12}{4}=3\)
5: \(=\sqrt{3}-\sqrt{2}+\dfrac{3+\sqrt{2}}{7}\)
\(=\dfrac{7\sqrt{3}-7\sqrt{2}+3+\sqrt{2}}{7}\)
\(=\dfrac{7\sqrt{3}-6\sqrt{2}+3}{7}\)