Question

Giúp e với ạ

Answer 1

\(=\dfrac{\left(\sqrt{5}+\sqrt{3}\right)^2+\left(\sqrt{5}-\sqrt{3}\right)^2}{\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}+\sqrt{3}\right)}\\ =\dfrac{8+2\sqrt{15}+8-2\sqrt{15}}{5-3}=\dfrac{16}{2}=8\)