Răspuns :
Salut !
439-81:3:3-2×9+3=415
439-27:3-18+3=415
439-9-18+3=415
430-18+3=415
412+3=415
..................
439-81:3:3-2×9+3=415
439-27:3-18+3=415
439-9-18+3=415
430-18+3=415
412+3=415
..................