giải pt : x4 - (1-√3) x2 - √3 = 0
Bài 4. Đường sông từ thành phố A đến thành phố B ngắn hơn đường bộ là 10 km. Để đi từ A đến B một ca nô đi hết 3h 20 phút, ô tô đi hết 2 giờ. Vận tốc ca nô kém vận tốc ô tô là 17km/h. Tính vận tốc ca nô Bài 5: Cho hình vuông ABCD. Trên cạnh AB lấy điểm E sao cho . Đường thẳng DE cắt CB kéo dài tại K. a) Chứng minh: Δ ADE đồng dạng với Δ BKE. b) Gọi H là hình chiếu của C trên DE. Chứng minh: AD.HD = HC.AE. c) Tính diện tích tam giác CDK khi độ dài AB = 6cm. d) Chứng minh: CH.KD = CD2 + CB.KB
Xin các cao nhân cách giải `\text{Thông minh}` cho bài này. Giải phương trình dưới
Vẽ chibi/anime nha nl: tuyển thành viên siêng cày tháng sau đua top nha
Cho 1,6 gam đồng (II) oxit tác dụng với 100 gam dung dịch axit sunfuric có nồng độ 20%. a) Viết phương trình hóa học. b) Tính nồng độ phần trăm của các chất có dung dịch sau khi phản ứng kết thúc.
Giúp mình vs ạ Mình cần gấp ạ Thank kiu mn trc
Vẽ chibi cute đi mn ới Hóng ghê Đẹp vào nhá
Các bạn giải giúp mình đi , 2h mình đi học rồi, hứa vote đầy đủ mà:(((
It .... Her I would follow teacher 's advice A.could B.will C.was D.were
I-Make the letter A, B, C or D on your answer sheet to indicate the correct answer to each of following questions (4.0 points) Question 1: A spacewalk occurs........an astronaut gets out of a vehicle while in space to do science experiments, or conduct repairs. A. who B. what C.when D.whom Question 2: Some people say that the role of family....to fit the development of society. A. will be changed B. is changed C. changing D. will change Question 3: Teachers provide a model for children...... A. imitating B. imitate C. to imitate D. imitated Question 4: They keep changing the decoration.....they can attract more young people. A. so that B. because C. although D. in spite of Question 5: I've......the product catalogue and decided to buy this table. A. looked through B. closed down C. found out D. turn off Question 6: Emergency teams are still clearing the.....from the plane crash. A. debris B.dust C. piece D. part Question 7: I hope you.........when arrive at 8 p.m. today! A.didn't work B. won't be working C. don't work D. aren't working Question 8: Your car is.....than mine. A. very bigger B. much more bigger C. more bigger D.much bigger Question 9: Mrs. Johnson put salt into the bowl of sugar by mistake,.......? A. doesn't she B. did she C. didn't she D.isn't she Question 10: It's very hot today. I wish I.....in a swimming pool now. A. am B. were C. can D. will be Question 11: Getting to the village is a very.........journey. A. interesting B. interested C. interest D. interests Question 12: My village lies near the......of the mountain and by the river. A. foot B. leg C. feet D. legs Question 13: What do you think about his.....of coins. A. collect B. collector C. collection D. collective Question 14: There is a small bamboo....at the entrance to the village. A. forest B. forestation C. forest ranger D. forestry Question 15: Minh is............the most successful student in my class. A.so long B.by how C. so now D.by far Question 16:A......is a solid figure or object, made by carving or shaping wood, stone,clay, etc. A.painting B.sculpture C.medal D.picture Question 17: Ho Chi MinhCity has been divided into twenty-four.....divisions since December 2003. A.administer B.administration C.administrative D.administrator Question 18: The new sports......has six tennis courts. A.complex B.match C.medium D.game by mistake. ...of coins? Question 19: Lan couldn't decide.....to work with on the project. A.who B.what C.how D.when Question 20:.............I was talking to my teacher, my friends were waiting outside the classroom. A. In order that B.While C. Although D. So that C. READING I. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks. (1.0 point) Facebook appears to be recovering from a more than 14-hour disruption to all of its products that left them mostly (31).........across the world. The company's main social network, its two messaging apps and image-sharing site Instagram were all affected. Facebook has yet to offer an explanation for the outage. The last time Facebook had a disruption of this magnitude was (32).......... 2008, when the site had 150 million users - compared with around 2.3 billion monthly users today. The problems began yesterday afternoon, and only showed real signs of recovery this morning. They meant core platforms many people rely on every day to communicate were rendered mostly useless. "We're aware that some people are currently (33).......... trouble accessing the Facebook family of apps," Facebook said in a statement, posted on Twitter. "We're working to resolve the issue as soon as possible." Facebook's apps seemed to be recovering on Thursday morning, with Instagram announcing it was back. In response to rumours posted on other (34)...........networks, the company said the outages were not a result of a Distributed Denial of Service attack, known as DDoS - a type of cyber-attack (35)........... involves flooding a target service with extremely high volumes of traffic. Question 31: A. uncomfortable B. unaffordable C. inaccessible D. unlucky Question 32: A. in B. at C. from D. of
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