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<math>\frac {a+c}{2}= b </math>
Somatório com <math>\sqrt{k}</math> expandido <math>n</math> vezes:
 
<math>\sum_{k=1}^{n} \sqrt{k} = \sqrt{1} + \sqrt{2}+...+\sqrt{n}</math>
 
Assumindo <math>n = 5</math>
 
<math>\sum_{k=1}^{5} \sqrt{k} = \sqrt{1} + \sqrt{2}+\sqrt{3}+\sqrt{4}+\sqrt{5}</math>
<math>\frac {\sqrt{1}+\sqrt{5}}{2}= 1,618033988749895 </math>

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