Tìm giá trị nhỏ nhất của biểu thức A = -2.x^2 - 10.y^2 + 4.x.y + 4.x + 4.y + 2016

3 xe ô tô chở được tất cả 3 tấn gạo 56 kg xe 1 là 25% tổng số gạo xe 2 chở 2/3 xe ba hỏi xe 3 chở được bao nhiêu

II. Choose the best option (A, B, C or D) to complete the sentence or replace the underlined word. 1. Mary was very unhappy last week, but she has _____________ now. A. cheered up B. made out C. believed in D. came up 2. Dubai's Palm Islands in the blue ocean is the _____________ of a good and sunny light. A. indicator B. view C. signal D. sign 3. This place is so _____________ with the non-stop flow of customers to come and enjoy Pho. A. delicious B. convenient C. popular D. exciting 4. You don’t need to _____________ to go the mail - jeans and a T-shirt are fine. A. dress in B. go over C. dress up D. turn up 5. Ha Noi also offers a nightlife as exciting as_____________ in Ho Chi Minh City. A. it B. which C. what D. that 6. Let me know when you come to Hoi An and 1I’ll _____________. A. take you out B. bring you around C. show you around D. cheer you up 7. We expected her at nine but she finally _____________ at eleven. A. tuned up B. tuned out C. came over D. grew up 8. Linda is taking extra lessons _____________ to what she missed while she was sick. A. take back B. keep up with C. get on well with D. look forward to 9. Visitors can take a free boat from Manhattan to Staten Island for a great _____________ of the Statue of Liberty and the Manhattan skyline. A. view B. sight C. scene D. landscape 10. He’s still hoping something will _____________. A. turn out B. turn up C. come over D. grow up 11. Professor Colin Evers _____________, a job at a famous university in Sydney. A. applied for B. found out C. made up D. stand up 12. We really can't, _____________ living like this- we'll have to find a bigger house. A. go out B. go over C. go up D. go on 13. When you want to relax, you'll have one of the world's _____________ cities at your feet, with more than 40% green space and open water to enjoy. A. greener B. greenest C. mostly green D. green mostly 14. It is considered that life in the city is wonderful and _____________. 3 A. funny B. boring C. enjoyable D. helpful 15. Opened in 1937, the Golden Gate Bridge in San Francisco still ranks among the top 10 _____________ bridge spans in the world. A. long B. longer C. mostly long D. longest

Fill in each gap with suitable relative pronoun : which , that , whose , whom or who : 1. Stop him . He’s the man _____________ stole my wallet . 2. There are many people ____________ are living in very poor condition . 3. I’ve ever read the book _____________ Huong gave me yesterday . 4. The man ___________ I saw last weekend said something totally different. 5. They have invented a television set ____________ is small as a watch . 6. This is the building ____________ was destroyed badly in the fire last night . 7. I’m talking about Tom, ____________ is really friendly. 8. The boy ____________ sister is in my class can speak Japanese and Korean languages . 9. The dictionary ______________ is on the table belongs to Long . 10. He wore a hat _____________ made him look like a cowboy . 11. The gentleman ____________ gave him the picture was his old teacher . 12. Mr David , _____________ comes from England , has never been to Vietnam . 13. Mr David , _____________son studies with us , has never been to Vietnam . 14. A bricklayer is a person ____________ builds houses . 15. Peter couldn’t come to the party last night , ___________ was really a pity . 16. We visited children _____________ parents are dead . 17. Do you have a good relationship with the person ____________ lives next door to you . 18. The student ____________ did this exercise might be very intelligent. 19. I’ll catch the train ____________ leaves at 10 a.m . 20. Ly Duc ,____________ won 2 gold medal at the Games , comes from Vietnam. 21. He can’t swim , ____________ makes me surprised. 22. We are visiting Ha Long , ____________ is in the north of Viet Nam . 23. I’m staying with the boy ____________ brother looks very handsome. 24. He talked about the books and writers _____________ made us bored . 25. This is the photo _____________ was taken yesterday . 26. Henry , ___________ you’ll met tomorrow , is also a member of the board . 27. Can you answer the questions ____________ I ask you ? 28. The lady ___________ son went on a picnic with us last weekend is a teacher at our school . 29. The woman ____________ book I borrowed is very generous . 30. He is the only friend ___________ I like .

1.Đốt một thanh sắt trong không khí. Rồi cho sản phẩm thu được vào dd HCl dư, thấy thoát ra một lượng khí. Cho toàn bộ sản phẩm thu được vào ddNaOH dư. Lọc lấy chất rắn sấy khô trong không khí, rồi nung ở nhiệt độ cao đền khối lượng không đổi. Em hãy nêu hiện tượng, giải thích và viết các PTHH xảy ra? 2/Một dd A chứa HCl và H2SO4 theo tỉ lệ số mol là: 3:1. Trung hòa 100ml dd A bằng 50ml dd NaOH có chứa 20g NaOH/lít. a/ Tính nồng độ mol/lit của mỗi axit? b/ 200ml dd A phản ứng vừa đủ với bao nhiêu ml dd B chứa NaOH 0,2M và Ba(OH)2 0,1M? c/ Tính tổng khối lượng muối thu được sau phản ứng giữa 2dd A và B? Giúp em vs ạ!! E sẽ cho 5 sao và câu trl hay nhất ạ!!! Giups e đi m.n e gấp lắmmmmmm!!!!!!!!!

Vẽ đậu mầm sợ hei =)) Y/c: Tradi, full line + màu, không vẽ ôli+ kẻ ngang, ko chụp mờ.. NL: Cô ơi độ e =)), có lẽ từ giờ chăm học Lý :< (mong mod ko xóa :<)

Combine sentences (Rút gọn câu) 1. In many places traditional food has been replaced by international food. International food is getting more and more popular. This could harm traditional culture. 2. People live in the city. People are facing a range of problems in their daily life. One of the problems faced by people is air pollution. Air pollution makes them stressed and depressed. 3. Eating fastfood seems modern and convenient. Children consume too much fastfood. They are gaining weight. The government should tax fastfood heavily. 4. I was going on a holiday at the beach. I bought some swim suit and sunglasses. I changed my mind at the last minute. I wanted to go skiing instead.

24+31= 91+9= 50+50= Thanks trước nha.

cho tam giác nhọn ABC có đường cao là AH. Vẽ HE,HF lần lượt vuông góc với AB,AC.cho góc BAC=a,AH=h.tính AH theo a,h

Exercise 1: Choose the correct answer 1. Without your help, I the technical problem with my computer the other day. A. can’t solve B. couldn’t have solved C. couldn’t solve D. weren’t solved 2. She helped us a lot in our project. We couldn’t continue without her. A. Unless we had her contribution, we couldn’t continue with the project. B. But for her contribution, we could have continued with the project. C. If she hadn't contributed positively, we couldn't have continued with the project. D. Provided her contribution wouldn't come, we couldn't continue with the project. 3. Unless you well-trained, you to the company. A. aren't / will never be admitted B. aren't / will never admit C. are / will never be admitted D. are / will never admit 4. ___________more help, I could call my neighbor. A. needed B. should I need C. I have needed D. I should need 5. Unless you__________all of my questions, I can’t do anything to help you. A. answered B. answer C. would answer D. are answering 6. Had you told me that this was going to happen, I____________it. A. would never have believed B. don’t believe C. hadn’t believed D. can’t believed 7. George wouldn't have met Mary to his brother's graduation party. A. if he has not gone B. had not he gone C. had he not gone D. if he shouldn't have gone 8. ten minutes earlier, you would have got a better seat. A. Were you arrived B. If you arrived C. If you hadn't arrived D. Had you arrived 9. If she a car, she would go out in the evening. A.have B. has C. has had D. had 10. The joke would not be funny if it into French. A. has been translated B. be translated C. was be translated D. were translated 11. We on the beach now if we hadn't missed the plane A. might have lain B. would lie C. could be lying D. would have lain 12. I think you should stop smoking. A. If I am you, I will stop smoking. B. If I had been you, I would stop smoking, C. If I were you, I would stop smoking. D. If I were you, I will stop smoking. 13. If he had been more careful, he__________ A. won't fall B. wouldn't fall C. wouldn't have fallen D. would haven't fallen 14. His health would be improved________ A. if he continued to smoke heavily B. unless he stopped smoking heavily C. if he gave up smoking D. if only he doesn't smoke any more. 15. He was driving very fast because he didn't know the road was icy. A. If he knew the road was icy, he wouldn't drive so fast. B. He hadn't been driving very fast if he would have known the road was icy. C. If he had known the road was icy, he wouldn't have been driving so fast. D. He wasn't driving very fast if he would know the road was icy. 16. I didn’t know that you were at home. I didn't visit you. A. If I knew that you were at home, I would visit you. B. If I had known that you were at home, I would have visited you. C. If I knew that you had been at home, I would have visited you. D. If I would know that you were at home, I visited you. 17. If Nam had passed the GCSE examination, he to take the entrance examination to the university. A. would have been allowed B. would have allowed C. will have allowed D. would allow 18. If it had not rained last night, the roads in the city so slippery now. A. would not be B. must not be C. could not have been D. would not have been 19. If he the lesson yesterday, he could do the test better today. A. has reviewed B. had reviewed C. will review D. reviewed 20. If it warm yesterday, we would have gone to the beach. A. was B. were C. had been D. could be lm hộ mik và giải thích nha