x1 chaffage x2 frigidaire x3 rassalate les contraintes: x1>5000 x2>500 x3>100 x1+X2+x3 < 30000 2000x1+950x2+1200x3<45000000 la fonction objective: MAX (3500-950)x1+(1200-900)x2+(650-400)x3