$$( \sqrt { 5 } + \sqrt { 7 } ) ( \sqrt { 13 } - \sqrt { 11 } )$$
$\sqrt{65}+\sqrt{91}-\sqrt{55}-\sqrt{77}\approx 1.410486888$
$$\sqrt{5}\sqrt{13}-\sqrt{5}\sqrt{11}+\sqrt{7}\sqrt{13}-\sqrt{7}\sqrt{11}$$
$$\sqrt{65}-\sqrt{5}\sqrt{11}+\sqrt{7}\sqrt{13}-\sqrt{7}\sqrt{11}$$
$$\sqrt{65}-\sqrt{55}+\sqrt{7}\sqrt{13}-\sqrt{7}\sqrt{11}$$
$$\sqrt{65}-\sqrt{55}+\sqrt{91}-\sqrt{7}\sqrt{11}$$
$$\sqrt{65}-\sqrt{55}+\sqrt{91}-\sqrt{77}$$
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