Jeu 1 :

Mes solutions :

742 = 7×(75+6×5+1)
742 = 7×(6+75×(5−1)/3)
742 = 6+(75×5−7)×(3−1)
742 = 5+(75+7)×(6+3)−1
742 = (6+3)×(75+7+1)−5
742 = 75×6×5/3−(7+1)