$$( 1 ) \frac { 1 } { \sqrt { 5 } - \sqrt { 3 } }$$
$\frac{\sqrt{3}+\sqrt{5}}{2}\approx 1.984059393$
$$1\times \frac{\sqrt{5}+\sqrt{3}}{\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}+\sqrt{3}\right)}$$
$$1\times \frac{\sqrt{5}+\sqrt{3}}{\left(\sqrt{5}\right)^{2}-\left(\sqrt{3}\right)^{2}}$$
$$1\times \frac{\sqrt{5}+\sqrt{3}}{5-3}$$
$$1\times \frac{\sqrt{5}+\sqrt{3}}{2}$$
$$\frac{\sqrt{5}+\sqrt{3}}{2}$$
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