$$\sqrt{ 5 } -2/ \sqrt{ 5 } +2- \sqrt{ 5 } +2/ \sqrt{ 5 } -2$$
$0$
$$\sqrt{5}-\frac{2\sqrt{5}}{\left(\sqrt{5}\right)^{2}}+2-\sqrt{5}+\frac{2}{\sqrt{5}}-2$$
$$\sqrt{5}-\frac{2\sqrt{5}}{5}+2-\sqrt{5}+\frac{2}{\sqrt{5}}-2$$
$$\frac{3}{5}\sqrt{5}+2-\sqrt{5}+\frac{2}{\sqrt{5}}-2$$
$$-\frac{2}{5}\sqrt{5}+2+\frac{2}{\sqrt{5}}-2$$
$$-\frac{2}{5}\sqrt{5}+2+\frac{2\sqrt{5}}{\left(\sqrt{5}\right)^{2}}-2$$
$$-\frac{2}{5}\sqrt{5}+2+\frac{2\sqrt{5}}{5}-2$$
$$2-2$$
$$0$$
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