Question

Aflati numerele de forma abc daca, abc-ab-c=486

Answer 1

$\overline{abc}-\overline{ab}-c=486\\10\overline{ab}+c-\overline{ab}-c=486\\9\overline{ab}=486\\\overline{ab}=54\\c \text{ poate lua orice valoare de la 0 la 9}\\Altfel~ spus~:\overline{abc}\in \{540,541,\ldots,549 \}$