numerele divizibile cu 2 de forma:
a)19a
190,192,194,196,198
b)5aa
500,522,544,566,588
c)7a8
708,718,728,738,748,758,768,778,788,798
d)a0a
202,404,606,808.
numerele divizibile cu 5 de forma:
a)74a
740,745
b)8a0
800,810,820,830,840,840,850,860,870,880,890
c)4a2a
4020,4050
d)a5ab
5550
