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1   02.02.2016 - 23:33 Vladdis пишет:

Яблок было не семь, а восемь.
Первый взял половину и еще пол-яблока - т,е 4,5 яблока.
Второй взял половину от того, что осталось (т.е. четверть от изначального количества) и еще половину яблока - 2,5 яблока. Итого первым двум покупателям фермер продал 4,5+2,5=7 яблок. Третий покупатель купил одно - восьмое, последнее.
Итого яблок было 8.

Решение такое: пусть Х - общее число яблок,тогда:
Х/2+0,5 - число яблок, купленное первым покупателем
Х/4+0,5 - число яблок, купленное вторым покупателем
1 - число яблок, купленное третьим покупателем.
Уравнение:
Х=(Х/2+0,5)+(Х/4+0,5)+1
Путем нехитрых действий получаем, что Х=8

2   03.02.2016 - 17:34 Оля Богатова пишет:

Vladdis, второй взял, по условию, "половину от того, что осталось". Если предполагать, что яблок было 8, то (8-4,5)/2 = 3,5/2. Это не 2.

3   03.02.2016 - 17:35 Оля Богатова пишет:

PS. Но спасибо за комментарий

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