http://civil-engineer.livejournal.com/ ([identity profile] civil-engineer.livejournal.com) wrote in [personal profile] civil_engineer 2014-05-01 06:46 am (UTC)

>> первая задача какая-то странная.

1) если х - скорость парохода, а у - скорость течения, то
1/(х+у) = 5
1/(x-у) = 7
Отсюда легко получить 1/у = 35.
(50 comments)

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