3)
6, 12, 36, 64, 72
26, 52, 65, 91, 104
40, 80, 100, 160, 200
43, 86, 129, 172, 215
4)
делители 15: 1, 3, 5, 15
18: 1, 2, 3, 6, 9, 18
делители 40: 1, 2, 4, 5, 8, 10, 20, 40
60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 30, 60
делители 12: 1, 2, 3, 4, 6, 12
24: 1, 2, 3, 4, 6, 8, 12, 24
делители 16: 1, 2, 4, 8, 16
21: 1, 3, 7, 21
4)
кратное 2 и 3: 6
кратное 4 и 12: 12
кратное 6 и 9: 18