2. 7 · 4 4 · 9

Решение: $$7 \cdot 4 = 28$$ $$4 \cdot 9 = 36$$ $$(13 - 4) \cdot 4 = 9 \cdot 4 = 36$$ $$4 \cdot (11 - 8) = 4 \cdot 3 = 12$$ $$5 \cdot 4 = 20$$ $$4 \cdot 6 = 24$$ $$(17 - 9) \cdot 4 = 8 \cdot 4 = 32$$ $$(50 - 45) \cdot 4 = 5 \cdot 4 = 20$$ Ответ: 28, 36, 36, 12, 20, 24, 32, 20