Jeu 1 :

Mes solutions :

414 = 1+7×(6×(8+2)−1)
414 = 7×(6×(8+2)−1)+1
414 = (8+1)×(6×(7+1)−2)
414 = (7+2)×(8×6−(1+1))
414 = (6×(7+1)−2)×(8+1)
414 = (8×6−2)×(7+1+1)
414 = 6×(7×(8+2)−1)