Jeu 1 :

Mes solutions :

454 = 75×6+5−25/25
454 = 75×6+5−(50−25)/25
454 = 50+(75+6)×5−25/25
454 = (75−25/25)×6+50/5
454 = 75×6+5−50/(25+25)
454 = 75×6+5−25/(50−25)