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первая бригада выполняет задание за 12 ч а вторая - 24 ч за сколько часов обе бригады выполнят задание при совместной работе?
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Предмет:
Математика -
Автор:
cooperbowman - 6 лет назад
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Ответы 1
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Думаю, что тут надо найти среднее значение 12+24/2=18 дней.
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Автор:
sweet-peateed - 6 лет назад
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Read the text and mark the sentences T (true) or F (false). Thanksgiving Day. Thanksgiving Day is the most popular American national holiday. In XV century European people wanted to trade with China. But the way to China was too dangerous and expensive. That's why Christopher Columbus wanted to find a new route to this country. He didn't find new way, but in 1492 he opened New World (now it's North America). A lot of people came to the New World for different reasons: trade; freedom of religion; the freedom of politician; and some economic reasons. The first colonies appeared in Virginia in 1607 along the eastern coast of North America. In 1620 the first group of pilgrims came to the New World. They came there too late so they couldn't get good crops. That's why, more then half of them died in the first winter. Next year the people who lived in America - Indians, taught the pilgrims how to survive there. They showed them a lot of new kinds of food: potato, corn. Indians taught the pilgrims how to hunt, fish, get a good harvest. That year people got a great harvest, and they called their friends - Indians, and gave them their thanks with a huge dinner. So in 1621 was born a new American national holiday - Thanksgiving Day. Now it's celebrated on the 4th Thursday of November. On this day everyone comes to the house of his parents and they have a great Thanksgiving dinner. E.g. Thanksgiving Day is an English national holiday. __F__ 1. Christopher Columbus wanted to find a new route to China because the way to this country was not safe and cheap. _____ 2. The first group of pilgrims opened the New World in 1620. _____ 3. The pilgrims gave Indians their thanks with a huge dinner because they taught the pilgrims how to survive. _____ 4. Thanksgiving Day. Now it's celebrated on the 4th Tuesday of November. _____ 5. Thanksgiving Day is a national American Holiday, which is dedicated to the birth of the USA. _____ 2. Grammar. a) Choose the correct item. 1. It … snow in summer. a) don’t b) doesn’t c) isn’t 2. … Dad … any brothers or sisters? a) Have … got b) Does … have c) Does … has 3. I go …school … bus. a) to, by b) into, at c) into, to 4. She goes to work … foot. a) by b) on c) in 5. It … yesterday, but today it is sunny. a) rains b) rain c) rained 6. A giraffe is … than a kangaroo. a) more tall b) taller c) the tallest 7. They … late for school yesterday. a) are b) were c) was 8. Nothing dangerous … tomorrow. a) to happen b) happens c) will happen 9. Did Ben … Russia last summer? a) visited b) visit c) visits 10. He often … the guitar because he is fond of music. a) plays b) played c) will play b) Underline the correct item. 1. The weather was/ were cold last week. 2. They are in/ at school now. 3. Don't make noise! Father is sleeping/ sleeps. 4. When she was a little girl she spent/ spended summer in the village. 5. I usually celebrate New Year with my family at/ on the 31st of December. 6. Where did/ was Mike go a month ago? 7. He is the baddest/ the worst pupil in class. 8. There are many big citys/ cities in Russia. 9. Students must/ mustn’t be late for the lesson. 10. How much/ many chocolate bars are there on the table?
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