Răspuns :
440:2=220:2=110:2=55:5=11:11=1( doar ca tu vei scrie asta in colonita in jos asa cum ati facut in clasa) 440= 2^3*5*11
539:7=77:7=11:11=1 539=7^2*11
539:7=77:7=11:11=1 539=7^2*11