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Bài2 : Rút gọn biểu thức sau: a) x( 2x² - 3) - x²(5x + 1) + x² b, 3x (x - 2) - 5x(1-x) - 8(x³ - 3) c) $\frac{1}{2}$ x² (6x - 3) - x (x² + 1) + (x + 4)
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Exercise 3: Read the following passage and use the information provided in the passage to decide which word or phrase A, B, C or D that best describes London. The majority of London's inhabitants live in its suburbs. Many of them travel to the city to work every day by train, bus, tube or car. These people are called "commuters". Commuters may spend as much as two hours every morning getting to work and another two hours getting home again. The cost of living in London is higher than that in most other parts of Britain. Millions of visitors come to London every year from all over the world to see the famous sights here such as Buckingham Palace and many other historic buildings. London is also very famous for its theatres, red buses and black taxis. Some people find it a noisy and dirty place but it has many large, pleasant parks. Here, everyone can enjoy some peaceful and quiet moments. London has many attractions both people from other parts of Britain and people from overseas. 1. In London ................... . * A. more people live in the suburbs than in the city center. B. most people live in the suburbs than in the city center. C. less people live in the suburbs than in the city center. D. many people live in the suburbs than in the city center. 2. Commuters ................... . * A. live in the city center. B. live in the suburbs and travel to work in the city. C. live in the suburbs and work there. D. live in the city center and work there. 3. Living in London is ................... . * A. cheaper than in most other parts of Britain. B. more expensive than in most other parts of Britain. C. most expensive than in most other parts of Britain. D. more cheap than in most other parts of Britain. 4. London is famous for ................... . * A. its delicious food. B. its theatres but not its red buses. C. its theatres, red buses and black taxis. D. its inhabitants. 5. The attractions of London are ................... . * A. for the Londoners only. B. only for people from other parts in Britain. C. just for foreigners. D. both for foreigners and for people from other parts in Britain.

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