Решение:
$$15 \cdot 4 = 15 + 15 + 15 + 15 = 60$$
$$10 \cdot 6 = 10 + 10 + 10 + 10 + 10 + 10 = 60$$
$$8 \cdot 3 = 8 + 8 + 8 = 24$$
$$3 \cdot 30 = 30 + 30 + 30 = 90$$
$$28 \cdot 2 = 28 + 28 = 56$$
$$8 \cdot 1 = 8$$
Ответ:
$$15 \cdot 4 = 60$$
$$10 \cdot 6 = 60$$
$$8 \cdot 3 = 24$$
$$3 \cdot 30 = 90$$
$$28 \cdot 2 = 56$$
$$8 \cdot 1 = 8$$