Cho 2a+b/a-2b = 2c+d/c-2d, chứng minh a/b=c/d

PART B. LANGUAGE FOCUS I. Choose the best answer A, B, C or D to complete the following sentences. 1. The kids are more interested ________ watching TV than playing sports. A. on B. of C. in D. at 2. He _________ out with his friends last week. A. is going B. goes C. has gone D. went 3. Jack: “Nowadays robots are helping us a lot in our work.” - Jimmy: “_____________” A. I agree with you. B. I hope not. C. Do you think? D. Do you agree with that? 4. VTV is a__________ television channel in Vietnam. A. wide B. international C. local D. national 5. “____________ talk in the class. We’re having a test.”, the teacher said. A. Doesn’t B. Won’t C. Don’t D. Can’t 6. “_______do you like the Modern English programme?” - “Because it helps me with my English.” A. What B. How C. When D. Why 7. There is a ____________ near my house, so I can go swimming very often. A. swimming suit B. swimming pool C. swimming glasses D. swimming hat 8. People in Japan are very polite _________ friendly. A. yet B. and C. but D. or 9. If I have a terrible headache, I_________ some medicines. A. am taking B. will take C. take D. would take 10. There are many different ways to___________ pollution. A. redo B. reuse C. reduce D. recycle II. Put the verbs in brackets in the correct form. 1. We (not, see) _______________ Lan since 2010. 2. Be careful! The teacher (look) _________________ at you. 3. People might (travel) _____________ to the Moon one day. 4. What__________ you (have) ___________ in your future house? 5. Jack is good at (repair) ______________ the household appliances. PART C. READING I. Read the following passage and put a word in the box in each of the numbered blanks. can - house - big - surrounded- in My dream is to live in a (1) _______ detached house. It will be (2) _______ by a big garden full of flowers and trees. I don’t like to live (3) _______ an apartment with blocks of flats. My dream house should be located outside the city where I (4) _______ find true peace and happiness. Therefore, my (5) _______ should have the things that shows my spiritual world and personality. 1.______________ 2.______________ 3.______________ 4.______________ 5.______________ II. Choose the correct word A, B, C or D for each gap to complete the following passage. Most children love (1) _______ activities. They play (2) ________, go skateboarding or go fishing. In countries with snow like Sweden, children go to the mountains with their parents to go (3) ________. They can make (4) ________ snowman in the playground in front of their house. When the weather is bad, they can stay at home and (5) ________ interesting programmes on TV. 1. A. outdoor B. indoor C. outdoors D. indoors 2. A. karate B. aerobics C. judo D. football 3. A. shopping B. skiing C. jogging D. running 4. A. any B. a C. an D. some 5. A. make B. tell C. watch D. play III. Read the passage and do the following tasks below. David lives in the countryside in Canada. He usually gets up early and does morning exercise with his bike. He rides around his area. After breakfast, he takes a bus to school. He has lessons from 9.00 am to 1.00 pm. He often has lunch in the school canteen and then he has a short rest. In the afternoon, he has lessons in the library or PE in the gym. After school, he often goes to the sports centre near his house and plays basketball or table tennis. In the evening, he often does his homework. He often goes to bed early. A. Write (T) for true or (F) for false statement Statements True False 1. David doesn’t live in the city in Canada. 2. He never gets up early in the morning. B. Answer the following questions 1. How does he go to school? ____________________________________________________________________________ 2. Does he have a long rest? ____________________________________________________________________________ 3. What sports does he play after school? ____________________________________________________________________________

Một ô tô khởi hành từ A để đi đến B với vận tốc 45km/h. Đến B người đó quay trở về A nhưng mới đi được 4/3 h với vận tốc đó thì người ấy giảm vận tốc đi 5km/h trên quãng đường còn lại trở về B. Biết rằng thời gian kể từ lúc xuất phát từ A đến khi về đến A là 8h 20 phút. Tính chiều dài quãng đường AB. giúp emm zứi :((

1 bếp điện ghi 220V-1200W đc sử dụng ở hiệu điện thế U=220V a, tính nhiệt lượng mà bếp tỏa ra trong tg 30p b, mỗi ngày bếp sử dụng 3h . tính tiền điện phải trả cho ve sử dụng trong 30 ngày, nếu giá 1kWh điện là 700 đồng mk cần gấp

Cho 16 g hỗn hợp A gồm : CuO và Fe2O3 .Tính khối lượng mỗi oxit trong A , biết rằng để hòa tan hết 16g A cần để 250 ml dung dịch HCl 2M

cho 18,4 gam hỗn hợp bột Al và Zn tác dụng với dd HCl .cô cạn dung dịch sau phản ứng thu đc 53,9 gam muối clorua khan .thể tích khí h2 thu đc là

VIII. Rewrite the sentences below without changing their original meaning. 1. Radioactive pollution is very dangerous. It can cause abnormal growth. [since] ​ 2. We did not go to school. It rained heavily . [because] ​ 3. I don’t have much money now, but I want to buy a new computer. If ​ 4. Light pollution happens. There is a change in animals’ living patterns. If ​ 5. Acid rain is dangerous. Trees’ leaves are damaged. [because of]

Trong bài thơ Lượm , có 1 câu thơ đc cấu tạo rất đặc biệt . Hãy tìm và phân tích dụng ý của tác giả khi tạo câu thơ đó

Làm giúp mình với ạ Mình cần gấp Cảm ơn ạ

Rút gọn: a, (a+b)-(2a+3b-c)+5a b, (a-b+c)-2(a+b-c)