user-avatar
phamthanhmy1282001
2 năm trước
cho x=âm1 phần 2,tìm y để đơn thức A=10xy mũ 2,2x mũ 2y.1 phần 5 xy có giá trị bằng 4
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Circle the word that has the underlined part pronounced differently from others 1. A. healthy B. ahead C. bread D. seatbelt 2. A. hey B. honey C. obey D. grey 3. A. played B. stayed C. needed D. filled 4. A. naked B. looked C. worked D. walked 5. A. record (v) B. vehicle C. lesson D. zebra II. Find which word which has a different stress pattern from the others. 1. A. direct B. affect C. open D. perform 2. A. succeed B. happen C. combine D. renew 3. A. invite B. receive C. finish D. rehearse 4. A. reward B. country C. samba D. music 5. A. local B. mistake C. between D. hotel 6. A. famous B. asleep C. pretty D. careful III. Choose the best option to complete each sentence. 1. The film was so boring. ____________ , Jack saw it from the beginning to the end. A. Therefore B. Despite C. However D. Although 2. I ___________________ go on foot when I was in primary school. A. has to B. used to C. can D. may 3. It must be amazing _______ elephant racing. A. see B. seeing C. to see D. saw 4. ____________ is Halloween celebrated? – On 31st October. A. When B. Why C. Where D. Which 5. __________ is not very far from here to the supermarket. A. There B. This C. It D. That 6. __________ the story of the film was good, I didn’t like the acting. A. Because B. Since C. As D. Although 7. I love the __________ of folk songs. A. perform B. performing C. performed D. performance 8. Mid-Autumn festival ____________ on the 15th day of the 8th lunar month. A. hold B. held C. is held D. be held 9. He thinks elephants are __________ animals. A. fascinated B. fascinating C. fascinates D. fascinate 10. La Tomatina is a seasonal ________ to celebrate the tomato harvest. A. festival B. parade C. celebration D. game IV. Supply the correct form of the words in brackets 1. Young children are expected to show _____________ to their parents. (obey) 2. When cycling on the roads, remember: _____________ first. (safe) 3. Children should avoid _____________ foods such as hamburgers and chips. (health) 4. Most road accidents happen because the motorists drive _____________. (care) 5. It is unsafe and _____________ to pass another vehicle on the left. (legal) 6. My _____________ was delayed for over two hours due to bad weather. (fly) V. Read the text carefully, then do the tasks. Large cities often have problems that small towns and rural areas do not have. Two of the biggest problems are heavy traffic and the pollution that cars create. Of course, traffic problems and pollution are not only found in big cities. However, the higher populations and larger number of cars on the roads in cities can make the problems happen more often and with more noticeable effects. One of the most common traffic problems the large cities have is congestion. As the population of a city increases, so does the number of cars on the road. Cities cannot always improve the number and size of their roads and highways to keep up with the number of cars. The result is traffic congestion, or traffic jams. When traffic jams happen, cars that are stuck in the congestion continue to run their engines. This creates pollution and is a big problem. Pollution causes health problems for the people in cities and also hurts the environment. A. Match the words with their meanings. 1. rural A. being too crowded or too full 2. noticeable B. unable to move 3. congestion C. easy to see or recognize 4. traffic jam D. in the countryside, not in the city 5. stuck E. too many vehicles in one place prevents B. Choose the correct answers. 1. Where do traffic problems and pollution frequently happen? A. small towns B. rural areas C. big cities D. remote villages 2. According to the passage, what causes traffic congestion in big cities? A. A lot of city dwellers B. Too many cars on the roads C. Careless drivers D. Less traffic signs on the streets 3. The high number of cars is caused by_________ A. urban planning B. traffic congestion C. environmental pollution D. the population 4. The highway and road network is ________ of meeting the requirement of increasing number of vehicles. A. full B. aware C. incapable D. uncertain 5. Which of the followings is NOT true? A. Only big cities have the problem of pollution. B. Traffic jams cause pollution C. Pollution is a major problem in big cities. D. Pollution causes health and environmental problems.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team