$$\sqrt{ \frac{ { 50 }^{ 2 } + { 67 }^{ 2 } + { 70 }^{ 2 } + { 73 }^{ 2 } + { 80 }^{ 2 } }{ 5 } - { 68 }^{ 2 } }$$
$\frac{\sqrt{2490}}{5}\approx 9.97997996$
$$\sqrt{\frac{2500+67^{2}+70^{2}+73^{2}+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{2500+4489+70^{2}+73^{2}+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{6989+70^{2}+73^{2}+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{6989+4900+73^{2}+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{11889+73^{2}+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{11889+5329+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{17218+80^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{17218+6400}{5}-68^{2}}$$
$$\sqrt{\frac{23618}{5}-68^{2}}$$
$$\sqrt{\frac{23618}{5}-4624}$$
$$\sqrt{\frac{23618}{5}-\frac{23120}{5}}$$
$$\sqrt{\frac{23618-23120}{5}}$$
$$\sqrt{\frac{498}{5}}$$
$$\frac{\sqrt{498}}{\sqrt{5}}$$
$$\frac{\sqrt{498}\sqrt{5}}{\left(\sqrt{5}\right)^{2}}$$
$$\frac{\sqrt{498}\sqrt{5}}{5}$$
$$\frac{\sqrt{2490}}{5}$$
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