Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "^-2" was replaced by "^(-2)".

Step  1  :

 1.1     12 = 22•3

(12)^-2 = (2²•3)^(-2) = (2)^(-4) • (3)^(-2)

Final result :

     1              
  ——————— = 0.00694 
  (24•32)