Jeu 1 :

Mes solutions :

974 = 25×(10+8)+75×7−1
974 = (75−10)×(8+7)−1
974 = 75×(25×8/10−7)−1
974 = 75×10+(25+7)×(8−1)
974 = 75×(8+(25+10)/7)−1
974 = 75×10+7×(25+8−1)