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1. Можно конечно посчитать на сколько поднимается и опускается улитка 10-9=1 см и поделить высоту столба на полученный результат 20 : 1=20 дней и получим неправильный ответ
А надо считать на сколько поднялись за день
1-й день начинается путь с земли поднялись на 10 достигла 10 см и опустились за ночь на 9 итого на второе утро улитка на 1 см
2-й день с одного см поднимается на 10 см достигла 11 см и опустилась на 9 итого 2см
10 й день с 9 см поднимается на 10 см достигла 19 см и опустилась на 9 итого 10 см
11-й день с 10 см поднимается на 10 см и ДОСТИГЛА 20 см ВЕРШИНА и снам совершенно не нужно знать что она опускается за ночь она га верщине
ответ 11 дней
2. книга представляет собой листы, которые начинаются с нечетной страницы и заканчиваются четной страницей . И кусок который выпал всегда начинается с нечетной и заканчивается четной. А раз начинается с 314, а это четное число то задача решения не имеет
х-45=66
х=66+45
х=111
Проверка:
111-45=66
66=66
ответ: 111 - задуманное число