Jeu 1 :

Mes solutions :

786 = (5+7×6×3)×(4+2)
786 = 3×((7+6)×5×4+2)
786 = 6×(5×3×(7+2)−4)
786 = 6×(7×(4+5×3)−2)
786 = 6×(5+7×3×(4+2))