0,3м²=3000см²( 1м²=10000см², 0,3х10000=3000см²)
1,3часа=78мин. (1час=60мин, 1,3х60= 78мин.)
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0,3м²=3000см²( 1м²=10000см², 0,3х10000=3000см²)
1,3часа=78мин. (1час=60мин, 1,3х60= 78мин.)