Предмет: Алгебра, автор: simenkalmykov

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Автор ответа: mussayevaaktoty
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Объяснение:

2) (25*27a²c³d²(b-1))/(9*5cd³a³(b-1))=15c²/ad

4) (12*13x^5y⁴a³b²)/(13*4*3ab²x³y²(y+3))=x²y²a²/(y+3)

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The lifestyle which we enjoy today is a result of countless ideas and inventions, which have taken many centuries of man’s history to develop.
1. The first great idea which started man on the road to his great achievements was when a caveman picked up a heavy stone to help him. The use of fire was another step without which no subsequent development would have been possible. But once man had learned to make and use fire, it was only a short step to discovering the use of metals. Another great move towards modern technology was the invention of the wheel by some unknown prehistoric genius.
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3. Another important invention which has contributed greatly to our modern knowledge was writing. At first, writing was a special form of drawing, and was usually very simple. But gradually these primitive drawings turned into letters. From the counting of days and months, man went on to count cattle and sheep and the earliest forms of arithmetic appeared. The Greeks were the first people to use writing to record language as spoken by contemporary men; and their works are still widely read today, for information and for pleasure.
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5. The seventeenth century saw a development of science. The eighteenth century is associated with many inventions and culminated in the Industrial Revolution. The invention of the steam engine, the condenser and piston made possible modern manufacturing processes. The nineteenth century was the age of the machine when man realized that many previously hard tasks could be done more easily and cheaply by machinery.Farm machinery was invented, and production of larg-er food-crops became possible. The nineteenth century also saw the invention of electricity, which revolutionized life and made many other things possible. The manufacture of cars began a new era in transport, and led to the appearance of lorries and buses, without which our cities would not have grown to their present size.
6. The previous century was the one to see immense changes and various inventions. The airplane was constructed. During the Second World War man became aware of atomic energy and nuclear weapons. The second half of the twentieth century was characterized by the inventions of television, computers, spacecraft, genetic engineering and many others.
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