18. Реши «круговые» примеры.

Решение: 1. $$85 : 5 = 17$$ 2. $$17 + 321 = 338$$ 3. $$338 - 470 = -132$$ 4. $$-132 - 35 = -167$$ 5. $$-167 \cdot 30 = -5010$$ 6. $$-5010 \cdot 9 = -45090$$ Ответ: $$85 : 5 = \textbf{17}$$ $$17 + 321 = \textbf{338}$$ $$338 - 470 = \textbf{-132}$$ $$-132 - 35 = \textbf{-167}$$ $$-167 \cdot 30 = \textbf{-5010}$$ $$-5010 \cdot 9 = \textbf{-45090}$$