Răspuns:
(c-54:19):9+72=720
(c-54:19):9=720-72
(c-54:19):9=648
c-54:19=648x9
c-54:19=5832
c-54=5832 x 19
c-54=110808
c=110862
(110862-54:19):9+72=720
(110808:19):9+72=720
5863:9+72=720
648+72=720
720=720
Explicație pas cu pas:
