Jeu 1 :

Mes solutions :

970 = (25−8)×(50+7)+1
970 = 50+5×(8+25×7+1)
970 = (50+8×(25−7))×5
970 = 50×25−8×7×5
970 = 5×(25×8+1−7)
970 = 5×((50−25)×8+1−7)

On étudie les probabilités au cycle 4.