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Thu gọn biểu thức sau

\(21\left(\sqrt{2+\sqrt{3}}+\sqrt{3-\sqrt{5}}\right)^2-6\left(\sqrt{2-\sqrt{3}}+\sqrt{3+\sqrt{5}}\right)^2-15\sqrt{15}\)

Giải phương trình sau

\(\frac{3+x}{2x-1}+\frac{2x}{x-2x^2}=3-\frac{4-x}{x}\)

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I. Use the words or phrases given to write meaningful sentences.

Positive & Negative Effects of Tourism

Tourism can bring many economic and social benefits, but mass tourism is also associated with negative effects.

1. First/ tourism/ create/ jobs/ tourism industry/ and/ other sectors/ such/ retail and transportation.

2. However/jobs/ created/ tourism/ often seasonal/ and/ poorly paid.

3. Second/ tourism/ encourage/ preservation/ traditional customs/ handicrafts/ festivals/ but/ interaction/ tourists/ also lead/ erosion/ traditional cultures/ values.

4. Finally/ ecotourism/ help/ conservation/ wildlife/ generating funds/ maintaining national parks.

5. Nevertheless/ it/ also cause/ pollution/ through traffic emissions/ littering/ noise.

Read the passage and do the tasks that follow. Son Doong Cave in Viet Nam - Good Morning America

Son Doong Cave and Swallow Cave (En Cave) were recorded and broadcast on Good Morning America - a programme of ABC Television (USA). By being broadcast on Good Morning America (ABC Television), Son Doong Cave would be introduced widely to international travellers.

This is a good chance for Quang Binh tourism to promote the image of Son Doong - the biggest cave in Viet Nam - to travellers around the world. Therefore, the film crew worked in the most favourable conditions. The programme was directly broadcast on satellite in May 2015.

The cave is a part of the underground system connecting over 150 other caves in Viet Nam near Viet Nam - Lao border with many caves such as Phong Nha Cave.

Son Doong Cave is compared equally to Mount Everest in terms of attraction. The biggest natural cave in the world is appreciated to be an interesting destination for a several-day tour, including exploring underground rivers, caves and camping... The overwhelming natural landscapes inside Son Doong Cave create an attraction by majestic and magnificent scenes. It takes months to end up a cave’s round. In addition, the condition to join tours in Son Doong Cave is extremely high? Adventurers must be in good mental and physical health to conquer the cave. Son Doong, the biggest cave in Viet Nam, along with other attractions in Quang Binh, is an attractive destination for travelers, especially those who are fans of natural exploration. The first exploration tour was held in early August 2013. The first tour consisted of 6 people from the US, Russia, Australia, and Norway. They underwent 7 days and 6 nights to explore Son Doong Cave. There are a large number of tourists registering for next tours since then.

Task 1. Identify whether the statements are true (T), or false (F).

1. Thanks to the programme of Good Morning America on ABC Television, a large number

of people around the world will know Son Doong Cave. True

2.The film crew making the programme about the cave met a lot problems from the local authorities.

3.There are many caves in Quang Binh province but Son Doong Cave may be the most well known.

4.The number of people climbing Mount Everest is the same as that exploring Son Doong Cave.

5.The exploration tour of Son Doong Cave is so hard that it requires tourists to have good physical and mental health.

6.Tourists can explore the cave in several months.

Task 2. Read the passage again and answer the questions.

1. When was the programme about Son Doong Cave on Good Morning America broadcast?

2. What can be found in the underground system in Quang Binh province?

3. In which aspect is Son Doong Cave compared to Mount Everest?

4. What activities can tourists do in the cave?

5. When was the first exploration tour held?

6. How long did the first group of tourists spend in the cave?

I. Read the passage, and choose the correct answer A, B, C or D for each question.

Situated on the central coast of Viet Nam, which is famous for many beautiful beaches. Lang Co Beach, since June 2009, has become an official member of the “World’s most beautiful bays” club. Today, it is a popular destination for tourists in Viet Nam, especially for those who love beach so much.

With the length of approximately 10 kilometres, Lang Co Beach located in Lang Co town, Phu Loc district, Thua Thien- Hue province is next to the National Highway 1A and near Hai Van Pass.

Lying on the most beautiful curve of the country, Lang Co has almost everything that the nature can offer: green mountains and tropical forests, smooth white sand, full of sunshine and cool, blue and clear sea as crystal, and the average temperature of 25⁰C in summer. It is an attractive destination for both domestic and international tourists in Viet Nam. It is the third bay of Viet Nam, after Ha Long and Nha Trang named in the list of 30 most beautiful bays in the globe.

It can be said that nobody can resist a nature beauty like Lang Co town. This small and peaceful town will give you the most relaxing time and many games at the beach. In addition, you will have good time to enjoy the seafood with various kinds of shrimps, lobster, crab, butter-fish, mackerel fish, oysters, etc. and not far from the beach are some attractions such as Kang Co fishing village, Chan May scenery.

Lying on the "Central Heritage Road", Lang Co is very close to other famous attractions such as the Imperial City of Hue, Hoi An Ancient Town, Son Tra Peninsula where the famous Son Tra Natural Reserve and beautiful beaches located, and so many more.

1. Lang Co beach is located ...... .

A. between Hoi An Ancient Town and Son Tra Peninsula

B. on the most beautiful curve of Viet Nam

C. 10 kilometres away from Hue

D. under Hai Van Pass

2. The most important reason why so many tourists come to Lang Co beach is that ..... .

A. it is the third most beautiful beach in Viet Nam

B. they can enjoy various kinds of seafood

C. they can come to the famous Son Tra Natural Reserve

D. it is considered an ideal place for beach lovers

3. All of the following are attractions of Lang Co Beach EXCEPT .......

A. the National Highway 1A next to it

B. smooth white sand, and full of sunshine

C. cool, blue and clear sea as crystal

D. its location on the "Central Heritage Road"

4. We can infer from the passage that Lang Co Beach ........ .

A. is very hot during summer

B.isthe most beautiful bay in the world

C. enjoy the harmony of nature and humans

D. is the first member of the “World’s most beautiful bays” club in Viet Nam

5. Coming to Lang Co Beach, you can do all of the following activities EXCEPT ........

A. relaxing and joining in beach games

B. sunbathing on many beautiful beaches

C. visiting the nearby fishing village

D. enjoying seafood