đường tròn(O;R) nội tiếp tam giác ABC.Gọi E và F là tiếp điểm trên cạnh AB,AC.Khi đó cung nhỏ EF có số đo là bao nhiêu? Giúp mình với ạ! Mình cảm ơn trước ạ

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 problems. 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? 5. 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.

Vẽ 1 bức tranh về mẹ Vẽ nghiêm túc, không cóp mạng và đặc biệt là k quá cầu kì (lúc sao ra giấy mệt)

Giúp mình với .¡ Build the meaningful sentence with the cue. 22. She/be/only/student/get/good/job. 23. Iv be/ service/ for/ I/ be/ greatful. *Rewrite the following sentences, using the suggestions: 24. Which was the first country which won the World Cup at rugby? (using an infinitive phrase) 25. The land which stretches away to the left all belongs to Mrs. Thompson. (using a participle phrase) *Rewrite the sentence as given word in the beginning. 26. My bicycle has been stolen. I got it last week. → My bicycle 27. Her parents enjoyed that film very much. They don't often go to the cinema. Her parents

Hãy dung phương pháp hóa học phân biệt các lọ khí mất nhãn sau: a) Oxi,hidro,Nito b) Oxi,hidro,cacbon

$\lim_{n \to \infty} \frac{n^6+4n}{3n^6-3n^4+2n^2-1}$

III. Choose the best answer a, b, c or d to complete the sentence. 1. You should walk across the street ______ the zebra crossing. a. on b. at c. in d. from 2. My house is not far from my school, so I usually go ______. a. on foot b. by foot c. by car d. by boat 3. This morning, I was ______ in a traffic jam and got to school fifteen minutes late. a. catch b. block c. struck d. stuck 4. Turn on the left turn ______ before you make the turn and slow down. a. sign b. direction c. signal d. crossing 5. It is ______ to use a hand-held mobile phone while driving or riding. a. safe b. important c. illegal d. careful 6. ______ does it take you to ride to school? – About 30 minutes. a. How long b. How far c. How often d. How much 7. A ______ is a part of a road that only bicycles are allowed to use. a. cycle cross b. cycle lane c. cycle line d. cycle race 8. You ______ cross the street when the light is red. a. should b. don’t have to c. can d. mustn’t 9. People ______ produce as much rubbish as we do now. a. use to b. used to c. used to not d. didn’t use to 10. “How far is Vung Tau from Ho Chi Minh City”-“_______” A. It’s not very far b. it takes about two hours or more. c. It’s about 120km d. You can get to Vung Tau by boat or bus. IV. Write the correct from or tense of verbs in brackets. 1. ____________________ (you/ ever/ drive) on the wrong side of the road? 2. My family ______________ (fly) back from our Hong Kong holiday two days ago. 3. Right now, the students _______________ (learn) road signs in the schoolyard. 4. Usually Oanh ______________ (walk) to school, but this week she _____________ (ride) her bike. 5. The driver was so drunk that he ______________ (lose) control of his car. 6. If I have enough money, I _________________ (buy) a racing car. 7. My father ________________ (teach) me to ride a bike when I was seven. 8. Transport used ______________ (be) much slower three hundred years ago. 9. Saudi women weren’t allowed ______________ (drive) a car until recently. 10. In South Africa, you have to let animals ________________ (go) first. V. 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 hamburger 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) 7. Everyone should _____________ obey traffic rules for their own safety. (strict) 8. The policeman _____________ the car to stop with a flashlight. (sign) 9. Signs with red circles are mostly _____________ - that means you can’t do something. (prohibit) 10. This _____________ sign indicates that traffic lights are ahead. (warn)

phương trình(m-1)x^2+2(m-1)x+3=0 có nghiệm kép khi m bằng bao nhiêu Giúp mình với ạ

Cho tam giác ABC vuông tại A, BM là đường trung tuyến. a) Biết AB = 6cm, AM= 4cm. Tính BC. b) Trên tia đối của tia MB lấy điểm N sao cho BM=MN. Chứng minh tam giác MBA = tam giác MNC. c) Chứng minh: AB+ BC > 2BM giải hộ mình với ạ,,,,,,,

Một lớp học có 52 học sinh bao gồm ba loại: Gioi ,Khá ,Trung bình .Số học sinh trung bình chiếm 7/13 số học sinh cả lớp .Số học sinh khá bằng 5/6 số học sinh còn lại .Tính số học sinh giỏi của lớp