7. Выполните действия:
а) 1ч 19 мин + 9ч 45 мин;
б) 57 мин 34 c + 31 мин 26 с;
в) 4 т 2 ц + 30 m 220 кг:
г) 4 кг 523 г + 3 кг 162 г.​
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