Ответ: \frac{\sqrt5-\sqrt3}{\sqrt5+\sqrt3} — \frac{\sqrt5+\sqrt3}{\sqrt5-\sqrt3} = \frac{(\sqrt5-\sqrt3)^2-(\sqrt5+\sqrt3)^2}{(\sqrt5+\sqrt3)(\sqrt5-\sqrt3)} = \frac{(5-2\sqrt{15}+3)-(5+2\sqrt{15}+3)}{5-3} =\\\\ =\frac{-4\sqrt{15}}{2} =-2\sqrt{15}
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