a) V cub = l³ = 8³ = 512 cm³
b) V cub = l³ = [ 5 intregi · 1 /6]³ = [ 5 · 6 + 1/ totul supra 6] ³ = ( 31 / 6)³=
= 31³ / 6³ = 29791 / 216 cm³
c) V cub= l³ = [ 2,1( 3)]³ = [ ( 213 - 21) / 90 ]³ = ( 192 / 90 )³ = ( 86/ 45)³ =
= 86³ / 45³ = 636056 / 91125 cm³