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1. Переставив члены пропорции, составьте ещё три верные пропорции из пропорции 45:0,9 = 350:7.
3. Из 225кг руды получили 34,2кг меди. Каково процентное содержание меди в руде?-
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rylanul49 - 5 лет назад
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marcel - 5 лет назад
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THE UNITED STATES OF AMERICA
The United States of America is the 4th largest country in the world after Russia, Canada and China. It occupies the central part of the North American continent.
The United States of America is a federal republic, consisting of 50 states including the states of Alaska and Hawaii. Outlying areas include Puerto Rico, American Samoa, Guam, and the US Virgin Islands.
The northern boundary is partly formed by the Great Lakes and the St Lawrence River; the southern boundary is partly formed by the Rio Grande. United States also has a sea-border with Russia.
The total area of the United States (including the District of Columbia) is about 9,809,000 sq km.
The country is washed by 3 oceans: the Arctic, the Atlantic and the Pacific. The country has many lakes, with the Great Lakes included. There are also many rivers on the US territory. The longest of them are the Mississippi, the Missouri, the Columbia, the Rio Grande and some others. On the US territory there are mountains and lowlands. The highest mountains are the Rocky Mountains, the Cordillera and the Sierra Nevada. The highest peak, Mount McKinley, is located in Alaska.
The climate conditions are rather different. The country is rich in natural and mineral resources: oil, gas, iron ore, coal and various metals.
The USA is a highly developed industrial and agricultural country. The main industrial branches are aircraft, rocket, automobile, electronics, radio-engineering and others.
Americans are made up from nearly all races and nations. The country population is over 250 min. The national symbol of the USA is its national flag «Stars and Stripes», having 50 white stars and 13 white and red stripes on its field, symbolising the number of the original and present day states.
Officially the country comprises 50 states and one District of Columbia. The states differ in size, population and economic development. Each state has its own capital. The capital of the USA is Washington. It is situated in the District of Columbia on the banks of the Potomac river and is named after the 1st US President - George Washington. There are many large cities in the country: New York, Los Angeles, Chicago, Philadelphia, Detroit, San-Francisco, Cleveland and some others.
The United States of America is a federal state, headed by the President. According to the US Constitution the powers of the Government are divided into 3 branches: legislative, executive and judicial.
Нужен перевод.(самостоятельный).-
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