Nguyên tử của nguyên tố x có tổng số hạt là 60 trong đó số hạt mang điện gấp đôi số hạt không mang điện. Tìm p,e,n ?

Cho f(x)=x^10-101.x^9+101.x^8-...+101.x^0. Tính f(100)

c) Giải hệ phương trình: 1/(x + y) + 3/(x - y) = 2 | - 2/(x + y) + 1/(x - y) = - 1

A. Pronunciation

• Intonation in statements, commands, and lists

Mark the intonation in the following sentences, using ↘↘ (falling intonation) or ↗↗ (level-rising intonation). Then practise saying them in pairs.

1. We should make clubs more interesting for teenagers.

2. It is important to raise people’s awareness of its importance.

3. Forms of cultural heritage include folk music, singing, and dancing.

4. We can go on a tour by boat, see areas of natural beauty, and listen to folk music.

5. All buildings are kept in their original state.

6. Young people can contribute more to heritage preservation.

7. We can see its natural beauty with beautiful limestone mountains, valleys, and rivers.

8. She enjoys reading novels set in the 19th century.

9. Cultural heritage may include temples, pagodas, and monuments.

10. The most UNESCO World Heritage Sites in Viet Nam are Hoi An, Phong Nha Cave, Thang Long Citadel, Hue Citadel and Ha Long Bay.

B. Vocabulary

• Words and phrases related to preserving heritage

I. Complete the sentences with the words given.

folk
historic
complex
historical
preserve
architecture
cultural heritage
restored
folk music
landscape
1. The art students were told to sketch the __________________.

2. He drew his inspiration from traditional Vietnamese __________________.

3. We want to __________________ the character of the town while improving the facilities.

4. The town’s modern __________________ is very well integrated with the old.

5. The badly neglected paintings have all been carefully __________________.

6. Modernizing __________________ buildings can often do more harm than good.

7. Many important __________________ documents were destroyed when the library was bombed.

8. We visited an exhibition of __________________ art.

9. Some old buildings were pulled down to make space for a new shopping __________________.

10. These monuments are a vital part of the __________________ of South America.

II. Match each description with the words below.

archaeology
permission
interpretation
admiration
preservation
civilization
Cambodia’s Angkor Wat National Museum collects and protects artifacts from the nearby Angkor Wat temple complex. 1 __________________

 The architects and builders who created Angkor Wat in Cambodia did amazing work. It impresses everyone who sees it. 2 __________________

 Archaeologists digging at Angkor Wat recently discovered a large statue buried beneath the ground.3 __________________

 Angkor was the capital city of the Khmer Empire, which ruled the area from the 9th to the 15th centuries. 4 __________________

 The museum gives a lot of explanation about the history of Angkor Wat and the people who built it. 5 __________________

 Sometimes, parts of Angkor Wat are closed to the public, and only workers are allowed to enter them. 6 __________________

C. Grammar

• To-infinitive clauses

I. Combine the first halves to the second ones to make meaningful sentences with to-inflnitive phrases.

1. I went to the garden centre

2. When the teacher asked him a question, Jack pretended

3. I bought a new screwdriver

4. Please open the door

5. My mother always said I should eat lots of green vegetables

6. Phong climbed on a chair

7. Before I visit Japan next summer, I really want

8. It’s a good idea

9. Mai has to practise at least four hours every day

10. Jim finally went to the dentist

______ A. to let some fresh air in.

______ B. to stay healthy.

______ C. to understand what she was saying.

______ D. to know where your children are at all times.

______ E. to get some relief from his toothache.

______ F. to get some fertilizers for my flowers.

______ G. to repair my bike.

______ H. to change a light bulb on the ceiling.

______ I. to learn some useful Japanese phrases.

______ J. to be ready for her piano competition next month.

II. Combine the suitable sentences in each group to form new meaningful ones using to-infinitive phrases.

1. I shouted. ______ A. I want to keep warm.

2. I had to go to the bank. ______ B. I want to report that my bike had been stolen.

3. I’m saving money. ______ C. I want to go to Singapore.

4. I went into hospital. ______ D. I had to have an operation.

5. I’m wearing two pullovers. ______ E. I needed to get some money.

6. I phoned the police station. ______ F. I want to warn people of the danger.

1. I shouted to _______________________________________________________________________.

2. _________________________________________________________________________________.

3. _________________________________________________________________________________.

4. _________________________________________________________________________________.

5. _________________________________________________________________________________.

6. _________________________________________________________________________________.

IV. Rewrite the answers in the short exchanges using to-infinitive phrases.

Example:

Why did you come here?

- Because I wanted to see my friends.

→→ I came here to see my friends.

1. Q: Why do you go to the beach every weekend?

A: Because I like swimming.

→→ She

2. Q: Why did you move to Ha Noi?

A: I wanted to find work.

→→ He

3. Q: Why are you leaving home?

A: I’m going to university in Tokyo.

→→ She

4. Q: Why are you having a party?

A: It’s my seventeenth birthday, and I want to celebrate it.

→→ He

5. Q: Why do you get up at five every morning?

A: I do my training then.

→→ He

6. Q: Why are you saving money?

A: I want to buy a new smartphone.

→→ She

7. Q: Why did you buy a new suit?

A: I want to wear it at the office party.

→→ He

8. Q: Why did you turn on TV very late last night?

A: We wanted to watch the World Cup final match.

→→ They

Lời giải chi tiết

kể tên các dụng cụ dùng điện và nêu sự chuyển hóa điện năng đối với dụng cụ đó

cho tam giác ABC vuông tại A  (AB< AC) . Các tia phân giác của góc B và C cắt nhau ở I . Gọi D,E,F lần lượt là chân đường vuông góc kẻ từ I đến AB,AC,BC.

  Chứng Minh BD= (BA+ BC - AC) : 2

Tam giác ABC, các tia phân giác của góc B và C cắt nhau ở I. Qua I kẻ đường thẳng song song với AB cắt AC, BC lần lượt D,E. Chứng minh DE = AD + BE

cần gấp giúp mình với

Part 2-oriented
Describe a space journey you would like to go on.
You should say:
- Where you would like to go
- Who you would like to go with
- What you would like to see or do there.

 Marcus có $200. Bạn ấy dùng $50 để mua sách và số tiền còn lại để mua quần áo. Tỉ số phần trăm của số tiền mà bạn ấy dùng để mua quần áo là:

a) x+y/x^2y+xy^2 và x-4y?x^2+2xy+y^2

b) x+y/xy^2+x^2 và 2x-y/y+1

c) 2x/x^2-8x+16 và x/3x^2-12x