Solution - Simplification or other simple results

Step  1  :

 1.1     25 = 52

(25)² = (5²)² = 5⁴

Equation at the end of step  1  :

  (253) • 54

Step  2  :

 2.1     25 = 52

(25)³ = (5²)³ = 5⁶

Equation at the end of step  2  :

  56 • 54

Step  3  :

Multiplying exponents :

 3.1    5⁶  multiplied by  5⁴   = 5^{(6 + 4)} = 5¹⁰

Final result :

  510