Jeu 1 :

Mes solutions :

381 = 25/25+(9−4)×(75+1)
381 = (25+75×25)/(9−4)+1
381 = 25×(25−9)−(75+1)/4
381 = (75×25+25)/(9−4)+1
381 = (75+25/25)×(9−4)+1