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Over any complex cubic hypersurface of dimension at least 2, the Chow groupof 1-dimensional cycles is spanned by the lines lying on the hypersurface. Thesmooth case has already been given several other proofs.  --  On montre que sur toute hypersurface cubique complexe de dimension au moins2, le groupe de Chow des cycles de dimension 1 est engendr\'e par les droites.Le cas lisse est un th\'eor\`eme connu. La d\'emonstration ici donn\'ee reposesur un r\'esultat sur les surfaces g\'eom\'etriquement rationnelles sur uncorps quelconque (1983), obtenu via la K-th\'eorie alg\'ebrique.

Droites sur les hypersurfaces cubiques