Question

1 supra 5 +1 supra 5 la puterea 2 +1 supra 5 la puterea 3 =?

Answer 1

   
[tex]\displaystyle \bf\\ \frac{1}{5} + \frac{1}{5^2} + \frac{1}{5^3} =\\\\ =\frac{^{25)}1}{5} + \frac{^{5)}1}{25} + \frac{1}{125} =\\\\ \frac{25}{125} + \frac{5}{125} + \frac{1}{125} = \frac{25+5+1}{125}= \boxed{\bf \frac{31}{125}} \\\\ [/tex]