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Câu 3:

Ta có: ƯC(a;b)=Ư(ƯCLN(a;b))

Nên ƯC(24;108)=Ư(ƯCLN(a;b))

Ta có: 24=\(2^3.3\)

108=\(2^2.3^3\)

\(\Rightarrow\)ƯCLN(24:108)=\(2^2.3\)=12

\(\Leftrightarrow\) ƯC(24;108)=Ư(12)

Vậy n=12

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12 thì trong tiếng anh là:

Living in the countryside has a lot of advantages, but also many disadvantages. As the advantage we can consider the fact that the country is less polluted and the traffic isn't so heavy. You are fit and you don't need to worry about your health condition, because in the countryside the air and water are so clean. In the country there are many plant species. There aren't any huge blocks of flats, modern skyscrapers or bothersome traffic jams. In the country you are free to admire the breathtaking landscapes such as huge meadows, peaceful hills or forests. You can enjoy walking in the forest and picking mushrooms or hunting. Another advantage is that you may easily build a big house and the garden, because charges for ground are much lower than in the suburbs. Moreover, living in the countryside is cheaper than it is in the city, so you probably may afford many other things, because the prices are lower. What is more, you can invite your friends to the barbecue organized in your garden. It would be great! The other positive side is the safety. In the rural area the crime rate is much lower. There aren't a lot of housebreaks and the possibility of burglary is also lower. In the countryside people usually and keep eyes on neighbour's estates. They always react when something strange is happening. Country life is very peaceful and silent. You will enjoy the feeling of peace.

However, there are a lot of positive aspects of living in the country side, there are also some disadvantages. Living in the country is slower. People don't need to hurry and have a lot of time. People in the country don't have to work so many hours as they do in the city. On the other hand, they don't earn so much money. Moreover, there aren't such interesting things to do during free time. The unemployment rate is also much higher than in the city. The problem may be also the communication. If you don't have your own car, you may have problem how to commute to work. The same problem concerns the access to the hospitals, schools, police stations and shops, which are usually located far from the village. Last of all, there are some dangers connected with country life such as heavy snowfall or rainfall.

To sum up, I think that living in the country may have a lot of advantages such as fresh air, breathtaking landscapes and comfort, but a lot of people decide to stay in the city, due to the fact that the life in the town is easier. The easy access to shops and other institutions are the great advantage.

- Nowadays, television has become the most popular media of human. It is also the necessary invention in our daily life. By watching TV, we can see many things happened all over the world. I agree that the advantages of watching TV are very important. But beside those benefits, there are some disadvantages that we must notice to be sure that we watch TV most effectively.
Beginning from the first one, I must say that television is one of the most important. From very long ago, people had already known how to transform information in many different ways but only when the first television programme was broadcasted, a new era had begun, the era of image. Television nowadays has been very popular, and almost every family has one. By sitting at home, watching TV, you can get a whole look all over the world. The appearance of television enriches our entertainments. Many events and competition can be watched “live” and many exclusive movies are presented as well, and you’re free to enjoy them. In addition, if you want to travel but do not have enough money, I suggest you can enjoy traveling in the TV (for example watching the discovery channel or national geography channel), they are screened 24/24.
Furthermore, the television deserves to consider as the unlimited source of information. There are a lot of scientific channel, which is suitable for all ages. It is the fastest and cheapest way to improve your knowledge. Today, Television specializes into many channels; each channel satisfies the different audience’s view such as news, sport, and film. By pressing several simple buttons, you can see your appropriate programme that fit your taste.
Everything contains good side and bad side and television has no exception. Wasting time is one of the disadvantages of watching TV. Let’s imagine : if one day , one person spends a hour watching TV without gaining any useful information , then in one year he will waste 365 hours and in 10 year is 3605 hours. With that time, you can learn several languages as well as finish some studying course. On the other hand, television programme are not always suitable for all ages. Sometimes, there are some movies contain bad information should not be watched, even by some adults. It will be extremely dangerous if parents neglect their children to discover the TV programme themselves, as they will immediately take influence of what they see. So, parents must supervise their children‘s TV watching throughout their childhood and adolescence period. In the aspect of health , spending hours watching TV is harmful to your eyesight. Why do not play some sport and breathe the fresh air .When your eyes are tired, you‘d better let them rest than continue to paste them in the screen.
In my opinion, I have reached a conclusion that nowadays, television is important. Although computer will replace it someday, but TV’s benefit to our life will be guaranteed it as the most important device, which people need, in order to be up-to-date.