Предмет: Математика, автор: Farid0160

найдите значение выражения - 3+0.7+0.009-0.2​

Ответы

Автор ответа: BelissaNitram
0

Ответ:

ну чтож, двадцать, так двадцать

3.509

Автор ответа: BUGAGA99
0

Ответ:

3.509

Пошаговое объяснение:

я похож на лоха ?)

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Money (part 1)
Before money, people could not buy and sell. There was trade; but it had to be two-way trade: people exchanged goods. For example, they exchanged food for clothes. With money, buying and selling became two things that could happen at different times and with different people. A person could sell food to somebody on one day and get money for it; a week later, he or she could use the money to buy clothes from a third person.
There have been metal coins for thousands of years. Some of the earlier coins were used in Turkey, and they were made of gold and silver. But this caused problems. People used to take very small bits of metal from each coin. Each coin was then a bit smaller, so people wanted more coins for their goods, and prices went up.
Metal coins were used by the Greeks thousands of years ago. The Greek drachma was made of silver. For hundreds of years, it was the most common kind of money for trade in Europe and parts of Asia. The Greeks even put drachma into the mouths of dead people: they believed the money would pay for their journey to the next world.
The Romans also used silver and gold coins. But the emperor Nero decided to put less gold and silver into the coins in order to make money for himself. After that, nobody wanted to use the coins, and this had a very bad effect on the Roman economy. The world had learned a lesson: money only works if people believe in its value.
Coins can be heavy. (For example, the people of Yap, an island in the Pacific, use stone coins; the biggest were about four meters across!) In the late eighteenth and early nineteenth centuries, people did not want to carry large bags of coins with them, so they left the coins with traders. The traders gave them “notes”: theses were just pieces of paper with a promise in writing to pay back the gold and silver coins. Soon, people started to use the notes themselves as money. Later, governments began to control money. They made their own notes for people to use.
Text 2.
Money (part 2)
In 1950, the first credit card was made. It was the Diners Club card, and it could only be used in 200 restaurants in New York. Today, almost all shops, hotels and restaurants in the world take credit cards, so people do not have to carry a lot of coins and notes with them when they travel.
As with anything there are advantages and disadvantages to using credit cards. Advantages:
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