Jeu 1 :

Mes solutions :

722 = 75×10−100×(5+2)/25
722 = (75×5−(100/25+10))×2
722 = (100−10)×(75/25+5)+2
722 = 75×10+2−(25+5)
722 = 100×75/10+2−(25+5)