Jawabanmu

2014-09-08T20:10:08+07:00
15= 3, 5
30= 2, 3, 5, 10, 15
60= 2, 3, 5, 10, 15, 20, 30
105= 3, 5, 7, 15, 21, 35
fpb= 3 dan 5
20 3 20
2014-09-08T20:17:24+07:00
15 = 3 X 5
30 = 2 X 3 X 5
60 = 2 X 2 X 3 X 5
105= 3 X 5 X 7
Fpb = 3 x 2
       = 6

12 4 12