реши уравнения и сделай проверку:

а) 25+(х-2)*15=70         б)72:(12-Х:4)=9

вырази в новых единицах измерения:
540мин=______________ч

7мин18=с ______________с

8ч45мин= _____________мин

4сут6ч= _______________ч

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