If a = 13 and b = 11, then the value of (a² + b² + ab)/(a³ - b³)

Question: If a = 13 and b = 11, then the value of (a² + b² + ab)/(a³ - b³)

Solution:
Given that
a = 13
b = 11

Now
(a² + b² + ab)/(a³ - b³)
= (a² + b² + ab)/(a - b)(a² + b² + ab)
= 1/(a - b)
= 1/(13 - 11)
= 1/2