Пусть скорость течения х, тогда по течению 45+х, а против течения 45-х по условию время равно расстоянию. деленному на скорость: 24:(45+х)+105:(45-х)=3 приводим к общему множителю: (24*(45-х)+105*(45+х))/(45+х)(45-х)=3 решаем уравнение 1080-24х+4725+105х=3*(2025-х2) х2- х в квадрате 5805+81х=6075-3х2 3х2+81х-270=0 решаем квадратное уравнение Д (дискриминанта)=(81 в квадрате)-4*3*(-270)=6561+3240=9801 х=-81+(корень из 9801)/2*3 второй корень имеет знак "-", поэтому не подходит (-81-99)/6. х=(-81+99)/6 х=18/6 х=3 км/ч - скорость течения ответ: 3 км/ч
Every country has its own holidays and traditions of celebrating them. Ukrainians love national holidays and regularly observe them. Although there are many holidays in the country, I’d like to tell you about the most memorable dates and events. Each year begins with New Year and Christmas. These religious holidays are well respected not only in Ukraine, but in many other countries. Ukrainian people have a habit of celebrating these days in grandiose way. They nicely decorate their houses, buy lots of presents in advance and cook delicious dishes. At Christmas, which is on January 7th, children sing traditional songs and receive various goodies. Next great holiday is the International Women’s Day in March. It’s not only the first spring holiday, but also the day when women are praised and pleased in every possible way. The most important days in April are connected with Easter. It’s a religious holiday, which honors the Resurrection of Jesus Christ. The 1st of May historically has been followed by demonstrations and organized street marches. It’s an International Workers’ Day. Another important day in May is the Victory Day. It commemorates the end of World War II. At the end of June the Ukrainian people celebrate their Constitution Day with plenty of concerts, fireworks, various musical shows. The exact date is the 28th of June. One of the most significant holidays in the country is the Day of Independence, which is celebrated at the end of August. Perhaps, it is the largest public holiday. That’s why it’s celebrated with impressive fireworks and noteworthy concerts. The exact date of the holiday is the 24th of August. There are plenty of other holidays, which are not public, but are also merrily celebrated. They are St. Valentine’s Day, St. Patrick’s Day, Halloween, Students Day, etc. вот перевод
Ӯ Насти было 345 рублей,
Пошаговое объяснение:
а у Юли на 67 рублей больше.
1)Сколько рублей у Юли?
2)Сколько всего рублей у обеих девочек?