Jeu 1 :

Mes solutions :

281 = 4×3×(9+3)×2−7
281 = 3×(9+7×4×3)+2
281 = 9×(7×4+3)+2
281 = 4×(9+3)×3×2−7
281 = 9×4×(3+3+2)−7
281 = (9+7×4×3)×3+2
281 = 9×(7+4×(3+3))+2