2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/209472We prove a version of Manin's conjecture for the projective plane blown up in three collinear points, the base field being a global field of positive characteristic.50 pages, in french, to appear in Annales de l'Institut FourierAlgebraic GeometryNumber Theory11G50, 14J26, 14C20text