The value of (1.6×1.6×1.6-0.6×0.6×0.6)/(1.6×1.6+1.6×0.6+0.6×0.6) is :

$\frac{1.6×1.6×1.6-0.6×0.6×0.6}{1.6×1.6+1.6×0.6+0.6×0.6}$

= 

a³ - b³ = ( a - b ) ( a² + b² + ab )

( a - b ) = \(\frac{a^3 + b^3}{a^2 + b^2 + ab }\)

\(\frac{a^3 + b^3}{a^2 + b^2 + ab }\) = $\frac{1.6×1.6×1.6-0.6×0.6×0.6}{1.6×1.6+1.6×0.6+0.6×0.6}$

Here a = 1.6

and b = 0.6

a - b = 1.6 - 0.6 = 1