6. Выполни действия. 6 мин 40 c+ 34 c = ? с
5 мин 30 c — 90 c = ?с
90 c+1 мин 30 c = ?с
50 с. 4 = ?с
3 мин 20 с: 4 = ?с
40 с. 2 = ? с​
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