Question

Ejercicio de potenciacion ​

Answer 1

$( {5}^{ - 2} ) - ( {5}^{ - 3} ) + ( {5}^{ - 4} ) = \\ ( \frac{1}{5} )^{2} - ( \frac{1}{5} )^{3} - ( \frac{1}{5}) ^{4} = \\ \frac{1}{25} - \frac{1}{125} + \frac{1}{625} = \frac{21}{625}$