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Помогите по математике решить задачу
В берёзовой роще росли 144 дерева Во время приезда туристов одна двенадцатая часть из них была вырублена Сколько деревьев недосчитались лесники?
После пикника туристов лесники недосчитались в берёзовой роще 12деревьев что составляет одну двенадцатую часть от их прежнего количества Сколько деревьев было в роще до пикника ?-
Предмет:
Математика -
Автор:
bam-bamnlni - 5 лет назад
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Ответы 1
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1/ 12 часть от 144 = 144 / 12 = 12 деревьев.12 / (1/12) = 12*12 = 144 дерева.Это где такие вандалы отдыхают ??? Руки бы им оторвать...
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Автор:
duke8rku - 1 год назад
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составить краткое содержание текста (The Printed Word)
e Printed Word
The earliest books were written on tablets of wood or pieces
of bark. In Greeceand Rome, the tablets of wood were covered with wax,
and writing was impressed upon them with a small stick called “stylus”.
These tablets were held together on one side with thin strips of leather
or metal rings. In Assyria and Babyloniaclay tablets were used for
writing and the words were drawn with a piece of wood. After baking, the
tablets were kept on shelves, just like books are kept today. Although
the clay tablets didn’t look very beautiful, they were long-lasting and
some of them survived until the present day. The earliest books of the
ancient world were written on papyrus and skins of young animals. These
books took the form of a long strip, rolled from one cylinder to
another. These writings were known to the Romans as volumen
from which comes the word volume. Though paper has been known inChina
since the first century, the secret of papermaking came toEurope much
later.
Books were quite common in ancientRome: we know that there
were many booksellers and the first public library was founded there
about 39 B. C. Only the rich could buy books or make their slaves copy
books from important libraries. By the time of the Middle Ages all books
were handwriting and often beautifully decorated. Libraries used to
chain books to the shelves so that they could not be removed from the
building. But very few people could read them. The invention of printing
was a really great event in history. The first people to invent
printing were the Chinese. InEuropethere were several people who can be
called inventors of printing. The best-known is Johann Gutenberg
fromGermany.
Printing spread quickly over Europeand by the end of the 15th
century there were more than 200 presses. The early printers were not
only craftsmen, but also editors, publishers and booksellers. The first
printing press inEngland was set up by William Caxton atWestminster in
1476, and the first printing press inRussia – by Ivan Fedorov inMoscow
in 1564. Printed books soon reached a very high standard and the
craftsmen were rightfully proud of their work. Eventually there were
more and more people inEurope who could read and they wanted more and
more books. That led to opening more libraries.
Early libraries were used only by scientists and were few. By
end by they grew in number and began to be used by the public. The 19th
century saw the appearance of a proper system of public libraries. Now
most countries have their own national libraries. Many old university
libraries have rich collections of books: Oxford and Cambridge in
England, Harvard and Yale in the United States. Among the great
libraries of the world we can name the British Museum Library (The British Library) in London, the Library of Congress in the United States, Bibliotheque Nationale in France, the Beijing Library in China , the State Public Library in Moscow.
The world’s largest is the US library of Congress. It holds about 90
million items – books and manuscripts. The library was founded in 1800
in Washington, DC for the use of Congress and later became a public
library. Bibliotheque Nationale dates back to the 17th century and the
British Museum Library was set in the 18th century. The State Public
Library inMoscow was founded in 1862 and has unique collections of
books.
Modern libraries do their best to help people get information
as quickly as possible. They use computers and electronic catalogues.
Probably the most difficult problem for any library is to keep their
books, journals and films. How they do it is a new story.
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