Răspuns:
a) D12={1,2,3,4,6,12}
D8={1,2,4,8}
12=3•2 la puterea 2
8=2, la puterea 3
(8,12)=2 la puterea 2=2•2=4
b)D10={1,2,5,10}
D25={1,5,25}
10=2•5
25=5 la puterea a doua
(10,25)=5
c) D18={1,2,3,6,9,18}
D24={1,2,3,4,6,8,12,24}
18=2•3 la puterea a doua 24=2la puterea a treia •3
(18 , 24)=2•3=6
d) D15={1,3,5,15}
D25={1,5,25}
15=3×5
25=5 la puterea a doua
(15,25)=5