$$\frac{ 3 }{ \sqrt{ 5 } + \sqrt{ 2 } }$$
$\sqrt{5}-\sqrt{2}\approx 0.821854415$
$$\frac{3\left(\sqrt{5}-\sqrt{2}\right)}{\left(\sqrt{5}+\sqrt{2}\right)\left(\sqrt{5}-\sqrt{2}\right)}$$
$$\frac{3\left(\sqrt{5}-\sqrt{2}\right)}{\left(\sqrt{5}\right)^{2}-\left(\sqrt{2}\right)^{2}}$$
$$\frac{3\left(\sqrt{5}-\sqrt{2}\right)}{5-2}$$
$$\frac{3\left(\sqrt{5}-\sqrt{2}\right)}{3}$$
$$\sqrt{5}-\sqrt{2}$$
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