Răspuns :
[tex]\it n= \overline{ab};\ \ \ a\cdot b > 60 \Rightarrow\ (a,\ b)\in\{(7,\ 9),\ \ (8,\ 8),\ \ (8,\ 9),\ (9,\ 7),\ (9,\ 8),\ (9,\ 9)\}\\ \\ Numerele \ cerute\ sunt:\ 79,\ \ 88,\ \ 89,\ \ 97,\ 98,\ \ 99\ .[/tex]
[tex]\it n= \overline{ab};\ \ \ a\cdot b > 60 \Rightarrow\ (a,\ b)\in\{(7,\ 9),\ \ (8,\ 8),\ \ (8,\ 9),\ (9,\ 7),\ (9,\ 8),\ (9,\ 9)\}\\ \\ Numerele \ cerute\ sunt:\ 79,\ \ 88,\ \ 89,\ \ 97,\ 98,\ \ 99\ .[/tex]