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Бревно 10 метров. За 2 минуты отпиливают по 1 метру. За сколько минут распилят все бревно?
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Предмет:
Математика -
Автор:
purdycrane - 5 лет назад
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Ответы 2
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За 9 шагов распилят пбревно полностbю, все это дело займет 18 минут
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Автор:
skinny - 5 лет назад
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0
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10м*2мин=20мин - все бревно за 10 минут
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Автор:
goldiekuhe - 5 лет назад
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0
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Из точки O, не принадлежащей ни одной
из двух параллельных плоскостей, проведены три прямые, пересекающие плоскости
соответственно в точках A, B, C и A1, B1, C1. Найдите BC, если OA = a, AA1 = b, B1C1 = c. -
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The Russian Federation is the largest country in the world. Russia is situated on two continents: Europe and Asia. It occupies about one-seventh of the earth's surface. Its total area is about 17 million square kilometers. The country is washed by 12 seas of the Pacific, the Artic and the Atlantic Oceans. In the south Russia borders on China, Mongolia, Korea, Kazakhstan, Georgia and Azerbaijan. It is bounded by Norway, Finland, the Bal¬tic States, Belorussia, the Ukraine in the west. It also has a sea-border with the USA.
There are different types of climate in different regions of the country. The climate is arctic in the north of the country. The climate is subtropical in the south of Russia. In the middle of the coun¬try the climate is temperate and continental.
There are two great plains in Russia: the Great Russian Plain and the West Siberian Lowland. There are several mountain chains on the terri¬tory of the country: the Urals, the Caucasus, the Altai and others. The largest mountain chain is the Urals. It separates Europe from Asia.
There are over two million rivers in Russia. The longest river is the Volga. The main rivers are the Ob, the Yenisei, the Lena, the Amur. Russia is rich in beautiful lakes. Lake Baikal (1600 metres) is the deepest lake in the world. The largest lake of Europe, Ladoga, is situated in Russia.
Russia has one-sixth of the world's forests. Russia is very rich in oil, coal, iron ore, natural gas, copper, nickel and other mineral resources.
The population of Russia is about 150 million people. More than 100 languages are spoken all over the country, but Russian is the state language. The capital of Russia is Moscow. Moscow is the largest political, scientific, cultural and industrial centre.
Russia is a parliamentary republic. The Head оf State is the President. The national symbol of Russia is a white-blue and- red banner. The white stripe symbolized the earth, the blue stands for the sky and the red one symbolized liberty. The hymn of Russia is written by Mickalkov. The national emblem is a two-headed eagle.-
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