https://mathweb.ru/allsystem.html?id=123748

вычесть 0000000000000000000000000000000000000000000000020000000000000000(16) и 000000000000000000000000000000000000000000000003ffffffffffffffff(16) = FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0000000000000001 Столбиком

Введите два числа и укажите их основание системы счиления:
................................................................
-0000000000000000000000000000000000000000000000020000000000000000
000000000000000000000000000000000000000000000003ffffffffffffffff
FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0000000000000001
Ответ: 000000000000000000000000000000000000000000000002000000000000000016 - 000000000000000000000000000000000000000000000003ffffffffffffffff16 = FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE000000000000000116