Solution - Power equations

Step  1  :

Equation at the end of step  1  :

Step  2  :

Equation at the end of step  2  :

Step  3  :

             52
 Simplify   ———
            523

Dividing exponents :

 3.1    5²   divided by   5²³   = 5^{(2 - 23)} = 5^(-21) = ¹/_5²¹

Final result :

   1                                    
  ——— = 2.09715 • 10-15 
  521