1) Решение:
$$1 \cdot b = 1 \cdot 4 = 4$$
$$1 \cdot b = 1 \cdot 79 = 79$$
$$1 \cdot b = 1 \cdot 98 = 98$$
$$1 \cdot b = 1 \cdot 100 = 100$$
2) Решение:
$$0 \cdot k = 0 \cdot 3 = 0$$
$$0 \cdot k = 0 \cdot 81 = 0$$
$$0 \cdot k = 0 \cdot 90 = 0$$
$$0 \cdot k = 0 \cdot 100 = 0$$
Ответ:
1) 4, 79, 98, 100
2) 0, 0, 0, 0