Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a2"   was replaced by   "a^2". 

Step  1  :

Multiplying exponential expressions :

 1.1    a²⁷ multiplied by a¹ = a^{(27 + 1)} = a²⁸

Final result :

  a28