Răspuns :
(280+120):100=400:100=4
900:(464+136-500)=900:100=9
(801-654+853):10:10=1000:10:10=100:10=10
100:(906-899):10=10:7:10=0,14
900:(464+136-500)=900:100=9
(801-654+853):10:10=1000:10:10=100:10=10
100:(906-899):10=10:7:10=0,14