Jeu 1 :

Mes solutions :

512 = 75+25+9+50×8+3
512 = 8+(9−50/25)×(75−3)
512 = 8+9×(50+75/25+3)
512 = (75−(50/25+9))×8
512 = 8+50×(75+9)×3/25