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в летнем лагере 36 человек. каждый мальчик дружит с 4 девочками, а каждая девочка дружит с 5 мальчиками. сколько мальчиков в лагере? а)16 б)18 в)19 г)20
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Предмет:
Математика -
Автор:
jiménez90 - 6 лет назад
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Ответы 1
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у-число мальчиков
х- число девочек
х+у=36
4х=5у
х=(5/4) у
(5/4)у+у=36
5у+4у=144
9у=144
у=144/9=16
16 мальчиков
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Автор:
dillon995 - 6 лет назад
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0
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IV. Перепишите и письменно переведите 2, 3 и 4-й абзацы текста.
The USA
The USA is one of the largest countries in the world. It is situated in the central part of the North American continent. The area of the USA is over nine million square kilometres. It is washed by the Pacific Ocean and by the Atlantic Ocean. The population of the United States is nearly 250 million people. The official language of the country is English. The capital of the country, Washington, was named in honour of the first President, George Washington.
If we look at the map of the USA we can see lowlands and mountains. The Cordillera and the Rocky mountains are well known mountains of the North American continent. America’s largest rivers are the Mississippi, the Missouri, the Rio Grande and the Columbia. As the USA is the large country, the climate is different in different regions. The Pacific coast is a region of mild winters and warm, dry summers. The region around the Great Lakes has changeable weather.
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furniture. When travelling round the USA we can visit the largest and the most beautiful cities: New York, Los Angeles, Chicago, and others.
The USA is a federal republic, consisting of fifty states. Each of these states has its own government. The seat of the central government is Washington, District of Columbia. According to the US constitution the powers of the government are divided into three branches: the executive, the legislative and the judicial. The Congress consists of the Senate and the House of Representatives. The President is the head of the State and the government. He is elected for four years. There are two main political parties in the USA: the Republican and the Democratic.
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manufacturing – промышленный
executive – исполнительная
legislative – законодательная
judicial – судебная
the powers – полномочия
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