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Giải hệ phương trình 3x -4y + 2 = 0 5x = 2y + 14 Giải hộ mình nha
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AI GIÚP EM VỚI About three thousand years ago, there were no shops. If you needed something you had to make it yourself. For example, if you needed something you wear, you had to kill an animal and get its coat. If you were a good hunter and had a lot of coats, you could exchange them for other things you needed. You could get meat, fruit or an axe. This way of exchanging things is called barter. Later on, people began to use money. They made money from things which would last and not go bad easily. They used stones, shells and animals’ teeth. After men had dicovered metal, they started to use copper, tin, silver and gold. They made these metals into small bar so that they were easy to store and carry about. Before there were banks, people kept their money themslves. Most people hid their money in the ground. They thought it was the safest place to store money. About five hundred years later, people began to make coins.They were easier to carry than metal bars. 1. There were no shops ___________ A. in the 15th century. B. five hundred years ago C. in China and Italy. D. about three thousand years ago. 2. What would you do if you wanted a coat thousands of years ago? A. Go to buy one from a shop. B. Kill an animal for its skin. C. Make friends with hunters D. Make one from cloth 3. The early way of exchanging one thing for another is called __________ A. metal melting B. coin- collecting C. banking D. barter 4. What kind of thing goes bad easily and is not good for making money? A. Metal B. Axe C. Food D. Shells 5. Why did people make coins? A. Coins were beautiful. B. Coins were easy to count C. They liked round coins instead of small bars. D. coins were easier to carry about.

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