[tex]\it 1)\ \overline{7a2b}\ \vdots\ 4 \Rightarrow a=orice \ cifr\breve a;\ \ b\in\{0,\ \ 4,\ \ 8\} \Rightarrow 10\cdot3=30 \ numere\\ \\ \\ 2)\ \ \overline{55xy}\ \vdots\ 25 \Rightarrow \overline{xy}\in\{00,\ \ 25,\ \ 50,\ \ 75\} \Rightarrow\ numerele\ sunt:\\ \\ 5500,\ \ 5525,\ \ 5550,\ \ 5575.[/tex]
