Предмет: Алгебра, автор: ЮлияУфимцева

Расстояние, равное 40км ,велосипедист проехал за 3ч . Первый час он ехал со скоростью ,на 2км/ч меньшей,чем в оставшееся время. Определите первоначальную скорость велосипедиста.
Решение уравнением!
Спасибо)

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Ответы

Автор ответа: dana56789
1
пусть х скорость в оставшееся время тогда скорость впервый час равна х-2 со скоростью х он двигался 2 часа хначит2*х растояние которое он проехах за 2 часа со скоростью х-2 он есхал час значит(х-2)*1 расстояние за первый час всего он проехал 40 кмзначит(х-2)*1+2*х=40решаемх= 14 нам надо было найти первоначальную которая была на два меньше 14-2=12 отв
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