Jeu 1 :

Mes solutions :

579 = 75+6×(100+10−(25+1))
579 = 75+(10−6)×(100+25+1)
579 = 100+6×(75+10−1)−25
579 = 6×(100+10−1)−75
579 = 10+6×(100−1)−25
579 = 100+25+10+6×(75−1)