Теплоход за 1ч прошёл 9 км по озеру и 20 км по течению реки.Найдите собственную скорость теплохода,если скорость течения реки составляет 3 км/ч

Теплоход за 1ч прошёл 9 км по озеру и 20 км по течению реки.Найдите собственную скорость теплохода,если скорость течения реки составляет 3 км/ч
- Предмет:
  Алгебра
- Автор:
  lewis56
- 5 лет назад

Ответы 2

Хкм/ч скорость собственная Уравнение: 9/Х + 20/(Х+3) =1 Общий знаменатель Х*(Х+3) Получишь: 9X+27+20X=X^2 +3X X^2 -26X-27=0 D1=196 X1=27 X2=-1 - не подходит по смыслу задачи Собственная скорость 27км/ч
- Автор:
  leftyo6fs
- 5 лет назад
- 0
1=9/V+20/(V+3) К общему знаменателю и проучится V2-26V-27=0 V=27
- Автор:
  brennacampos
- 5 лет назад
- 0
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Теплоход за 1ч прошёл 9 км по озеру и 20 км по течению реки.Найдите собственную скорость теплохода,если скорость течения реки составляет 3 км/ч

Ответы 2

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