278 сек = ... мин ... сек 1) 2 мин 78 сек 2) 5 мин 28 сек 3) 4 мин

18 сек 4) 4 мин 38 сек.
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1 а = ... см2

1) 100000 см2 2) 1000000 см2 3) 10000000см2 4) 100000000см2

ПоМоГиТе ПоЖаЛуЙсТа!!!
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