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MaksimSulteev
MaksimSulteev
21.12.2020 09:06 •  Математика

Умальчика в коллекции 14 марок с самолетами и 28 марок с танками. все марки мальчик разместил в альбом и наклеил по 7 марок на каждую страницу. сколько страниц ему для этого понадобилось? тоже самое только цифры другие 16,38,9

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Ответ:
nastya200302033
nastya200302033
21.12.2020
При первых условиях: 6
При 2ых: 6
4,6(65 оценок)
Ответ:
Сколько страниц ему для этого понадобилось?
1)14 + 28 = 42 (м) - всего
2)42 : 7 = 6 (стр) - понадобилось

1)16 + 38 = 54 (м) - всего
2)54 : 9 = 6 (стр) - понадобилось
4,6(88 оценок)
Открыть все ответы
Ответ:
оффЛис
оффЛис
21.12.2020
Если рядом сидят два химика, то правый скажет правду: НЕТ.
Если рядом сидят два алхимика, то правый соврет: НЕТ.
Таким, образом, ответ НЕТ возникает в том случае, если рядом сидят два одинаковых человека: два химика или два алхимика.
Допустим, у нас n химиков.
Тогда ряд из (n+1) рядом сидящих алхимиков дает n ответов НЕТ.
Ряд надо составлять из алхимиков, чтобы химиков получилось минимальное, а не максимальное количество.
Пусть все химики сидят через одного с алхимиками.
ХАА...АХАХА...ХА
Разобьем их на пары
(ХА)А...А(ХА)(ХА)...(ХА)
Здесь n А подряд и n пар ХА. Всего n + n А и n Х.
n + n + n = 160
3n = 160
Но 160 не делится на 3, поэтому такого не может быть.
Значит, есть хотя бы одна пара Х подряд.
(ХА)(ХХ)А...А(ХА)(ХА)...(ХА)
Здесь 2 химика, еще (n-2) пары ХА и ряд из n А.
Химиков по-прежнему n, а алхимиков n + (n-2)
n + n - 2 + n = 160
3n - 2 = 160.
3n = 162
n = 54
4,4(83 оценок)
Ответ:
tseng7788
tseng7788
21.12.2020

Пошаговое объяснение:

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4,6(44 оценок)
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