Question

Помогите пж 4/(√13-√5)

Answer 1

Решение на фоторафии!!!!!

Answer 2

$\frac{4}{\sqrt{13}-\sqrt{5}}=\frac{4*(\sqrt{13}+\sqrt{5} )}{(\sqrt{13}-\sqrt{5})(\sqrt{13}+\sqrt{5})}=\frac{4(\sqrt{13}+\sqrt{5})}{(\sqrt{13})^{2}-(\sqrt{5})^{2}}=\frac{4(\sqrt{13}+\sqrt{5})}{13-5}=\frac{4(\sqrt{13}+\sqrt{5})}{8}=\\=\frac{\sqrt{13}+\sqrt{5}}{2}$