Jeu 1 :

Mes solutions :

418 = (25+4×3+1)×(10+1)
418 = 1+3×((25+10)×4−1)
418 = (10+1)×(25+4×3+1)
418 = (25+10)×4×3−(1+1)
418 = (10×(25−4)−1)×(3−1)
418 = 3×((25+10)×4−1)+1
418 = (3−1)×(10×(25−4)−1)