Jeu 1 :

Mes solutions :

987 = ((25+50/25)×8−75)×7
987 = (50×(75+8)/25−25)×7
987 = ((50/25+25)×8−75)×7
987 = (75+50×(25+8)/25)×7
987 = ((75×50−25)/25−8)×7