Вспомни соотношение единиц величин.Вычисли.1) (3 ч 45мин+ 2ч 15мин):3; 2) (4ч 15мин+90 мин)- 1ч 45мин : 3; 3) (15 мин 45 с : 5 + 9 мин 57с-59с)×4;
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