  Toute hypersurface cubique lisse complexe de dimension au moins 2 dont
l'\'equation est donn\'ee par l'annulation d'une somme de formes cubiques \`a
variables s\'epar\'ees, chaque forme impliquant au plus trois variables, est
universellement $CH_{0}$-triviale.
  ---
  If a smooth cubic hypersurface of dimension at least 2 is defined by the
vanishing of a sum of cubic forms in independent variables and each of these
forms involves at most 3 variables, then the cubic hypersurface is universally
$CH_{0}$-trivial : there is an integral Chow decomposition of the diagonal.
