Răspuns :
(80-64):8=80:8 - 64:8= 10-8=2
(72-9):9=72:9 - 9:9= 8-1=7
(81-45):9=81:9 - 45:9 =9 - 5=4
(100-60):10= 100:10 - 60:10 = 10 - 6=4
(72-9):9=72:9 - 9:9= 8-1=7
(81-45):9=81:9 - 45:9 =9 - 5=4
(100-60):10= 100:10 - 60:10 = 10 - 6=4