(117 x 117 x 117 - 98 x 98 x 98) / (117 x 117 + 117 x 98 + 98 x 98) =?

Given expression = (a³ - b³) / (a² + ab + b²), where a=117, b =98
= [(a-b)(a² + ab + b²)] / (a²+ab+b²)
=(a-b)
=117 - 98
= 19.