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NikaMar12
NikaMar12
27.02.2021 12:57 •  Математика

Найдите скорость лодки по течению реки и против течения, если её соб скорость 8 км\ч , а скорость течения реки 1 целая 1/2

👇
Ответ:
Долгинцев
Долгинцев
27.02.2021
Решение:
8+1 1/2=8+3/2=19/2=9,5 км/ч по течению
8-1 1/2=8-3/2=13/2=6,5 км/ч против течение
4,7(52 оценок)
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Ответ:
ROMMIT2
ROMMIT2
27.02.2021

Пошаговое объяснение:

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4,4(68 оценок)
Ответ:
анна2255
анна2255
27.02.2021

Смотрите.

1) Обозначаем t — сколько времени они шли в первый день, тогда (t-1) — сколько во второй.

2) Теперь следующее соотношение — про 6 километров. Пускай в первый день они км, а во второй день — s2, тогда нам дано:

s1-s2=6.

3) Вспоминая, что расстояние=время*скорость (s=v*t), подставляем в эту формулу вместо s1 и s2:

(3,5*t)-(3*(t-1))=6.

Упрощаем:

3,5t-3t+3=6;

0,5t=3;

t=6.

ответ: Таким образом, в первый день они шли 6 часов. Во второй день — 6-1=5 (часов во второй день — 3*5 = 15 (км)

Пошаговое объяснение:

4,7(15 оценок)
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