Jeu 1 :

Mes solutions :

406 = 7+(100−5)×5−(75+1)
406 = 7+5×(100−5)−(75+1)
406 = (75+7)×5+1−5
406 = 7+5×(75+5)−1
406 = 7+(75+5)×5−1
406 = 75×(7+100/5)/5+1