$$\sqrt{ \frac{ { 32 }^{ 2 } + { 61 }^{ 2 } + { 75 }^{ 2 } + { 82 }^{ 2 } + { 90 }^{ 2 } }{ 5 } - { 68 }^{ 2 } }$$
$\frac{\sqrt{10370}}{5}\approx 20.366639389$
$$\sqrt{\frac{1024+61^{2}+75^{2}+82^{2}+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{1024+3721+75^{2}+82^{2}+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{4745+75^{2}+82^{2}+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{4745+5625+82^{2}+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{10370+82^{2}+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{10370+6724+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{17094+90^{2}}{5}-68^{2}}$$
$$\sqrt{\frac{17094+8100}{5}-68^{2}}$$
$$\sqrt{\frac{25194}{5}-68^{2}}$$
$$\sqrt{\frac{25194}{5}-4624}$$
$$\sqrt{\frac{25194}{5}-\frac{23120}{5}}$$
$$\sqrt{\frac{25194-23120}{5}}$$
$$\sqrt{\frac{2074}{5}}$$
$$\frac{\sqrt{2074}}{\sqrt{5}}$$
$$\frac{\sqrt{2074}\sqrt{5}}{\left(\sqrt{5}\right)^{2}}$$
$$\frac{\sqrt{2074}\sqrt{5}}{5}$$
$$\frac{\sqrt{10370}}{5}$$
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