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Консультация № 190983
10.05.2017, 17:48
0.00 руб.
1
1
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Здравствуйте! У меня возникли сложности с таким вопросом (смотрите в приложении):
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Обсуждение
11.05.2017, 06:47
общий
это ответ
Здравствуйте, svrvsvrv!
Пусть x - скорость лодки в стоячей воде, тогда на путь по течению она потратит 7/(x+2) часа, а на путь против течения - 3/(x-2) часа. По условию задачи
откуда
Из двух решений данного уравнения (x = 0 и x = 5) физический смысл имеет только последнее, то есть скорость лодки в стоячей воде равна 5 км/ч.
Пусть x - скорость лодки в стоячей воде, тогда на путь по течению она потратит 7/(x+2) часа, а на путь против течения - 3/(x-2) часа. По условию задачи
откуда
Из двух решений данного уравнения (x = 0 и x = 5) физический смысл имеет только последнее, то есть скорость лодки в стоячей воде равна 5 км/ч.
5
Спасибо.
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