Jeu 1 :

Mes solutions :

561 = 9×9+(100−4)×(8−3)
561 = 100×8+4−9×9×3
561 = (9+8)×(9×4−3)
561 = (100+9×9×8)×3/4
561 = 9+(100−8)×(9−3)
561 = 9+8×(100−(4+9×3))
561 = 9×8×4+(100−9)×3