Предмет: Математика, автор: ника47471

6 задание по подробнее плиз

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Ответы

Автор ответа: spirinamv
0
я бы ни одно не взяла, а почему???
потому, что уравнение должно быть таким
210:7-х=192:8+х, но дальше получаем
30-х=24+х - значит ответ А
-2х=24-30
-2х=-6
х=-6:(-2)
х=3(кмч) скорость течения реки

Автор ответа: aleks41
0
Скорость по течению v1=s1/t1, где s1-расстояние по течению, t1-время в пути по течению, v1=210/7=30 км/час.
Скорость против течения v2=s2/t2, где s2- расстояние против течения,  t2-время в пути против течения, v2=192/8=24 км/час.
Собственная скорость лодки равна 30-х=24+х.
Ответ:30-х=24+х.
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