Выполним вычисления:
a)
$$20 \times 3 = 60$$ $$12 \times 8 = 96$$ $$74 \div 9 = 8 \text{ (остаток 2)}$$б)
$$(82 + 18) \div 5 \times 2 = 100 \div 5 \times 2 = 20 \times 2 = 40$$ $$48 \div 12 = 4$$ $$78 \div 6 = 13$$ $$580 + 50 = 630$$ $$370 - 40 = 330$$ $$428 - 400 = 28$$ $$234 - 34 = 200$$