Предмет: Математика, автор: invoker228133

Срочно помогите,решить задачу.
За три недели отремонтировали 58 км дороги. За первую неделю отремонтировали в 3 раза больше,чем за третью,а за вторую - на 8 км больше,чем за третью.Сколько километров дороги отремонтировали за третью неделю?

Ответы

Автор ответа: annalim2016

третью неделю представляем в виде X , значит первая - 3x. а значение второй x+8
уравнение получается таким 58=3x+x+x+8
Решение:58=5x+8
Далее:50=5x
Результат : x=10
Ответ 10км

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