Jeu 1 :

Mes solutions :

756 = (75+75+25+7+7)×4
756 = 7×(75/75+7+25×4)
756 = (7+7)×(75+4−25)
756 = 7×(75+75×(7+4)/25)
756 = (7+(75/75+25)×7)×4
756 = ((75/75+25)×7+7)×4