Cho x là số thực bất kỳ. Tìm GTLN và GTNN của A= (x^2+2x-1)/(x^2+1)

Một xe máy chuyển động với vận tốc 18 km/h bằng động cơ có công suất là 1500 W. a/. Chứng minh rằng P = F.v b/. Tìm độ lớn lực kéo của động cơ xe máy.

31. We like the film very much. The _______ are unforgettable and the plot is gripping. A. characters B. acting C. style D. action 32. Easter is a/an _______ festival which is celebrated in many countries. A. enjoy B. interest C. amused D. joyful 33. The people who watch a film are called _______. A. directors B. actors C. characters D. audiences 34. A film that tries to make audiences laugh is called _______. A. comedy B. documentary C. cartoon D. romantic comedy 35. Titanic is a romantic film, which was _______ by James Cameron. A. played B. starred C. directed D. shown 36. Critics say Pirates of Southeast Asia is shocking but it is a _______. A. must-see B. film C. survey D. review 37. She is going to Rio Carnival to watch _______ dance. A. perform B. performers C. performances D. performs 38. We saw a _______ of water coming from the water cannons at La Tomatina Festival. A. jet B. goggles C. highlight D. truck 39. I saw a _______ of flower floats when I attended the festival last year. A. celebration B. culture C. perform D. parade 40. Diwali, the Hindu Festival of Lights, shows the _______ richness of this country. A. culture B. cultural C. culturally D. cultured 41. There are many _______ on the street: cars, buses, bikes, motorbikes. A. transport B. engines C. machines D. vehicles 42. This movie is about the war between the planets in the space. It is a_______ movie. A. romantic B. sci-fi C. comedy D. documentary 43. Carnival (Carnaval in Portuguese) is a popular _______ in many countries in South America. A. festival B. parade C. film D. celebrate 44. If people ________ the rules, there are no more accidents A. follow B. obey C. take care of D. remember 45. About a quarter of ______ accidents are the result of driving under the influence of alcohol. A. congestion B. congestive C. traffic D. traffics 46.  In September, he will visit museums in Berlin then ______ the train to Moscow! A. ride B. take C. drive D. hold 47. ______ is an area of road marked with broad black and white lines where vehicles must stop for people to walk across. A. zebra cross B. zebra crossing C. zebra across D. zebra acrossing 48. When riding a skateboard, children should obey all ______. A. traffic regulars B. traffic C. traffic rules D. traffic choices 49.  Don’t be surprised if you get stuck in a traffic ______ in the morning when you stay in Ho Chi Minh city. A. warden B. light C. jam D. circle 50. The child always needs to ______ a helmet when riding with you. A. bring B. pick C. put D. wear

Mọi người trình bày bài này đầy đủ nhé :3

Thông điệp rút ra qua bài lá rụng của Khải Hưng là gì ạ?

bài 1 a)2x+12=3(x-7) b)-2(2x-8)+3(4-2x)=(-72)-5(3x-7) bài 2.cho biểu thức:A=(-a-b+c)-(-a-b-c) a)rút gọn A b)tính giá trị của A khi a=1;b=-1;c=-2

1. Drivers have to _______ your seatbelt whenever they drive. A. tie B. put on C. fasten D. put 2. Avoid the rush hour and you won’t get stuck in a _______. A. railway station B. traffic jam C. speed limit D. train ticket 3. If you don’t have _______, you will able to drive on the road. A. helmet B. warm clothes C. mask D. driving license 4. Be careful or you will fall _______ your bicycle. A. off B. of C. in D. on 5. You must _______ the traffic rules for your safety and that of other road users. A. allow B. obey C. keep D. be 6. It is _______to drive on the left in Vietnam. A. illegal B. legal C. allowed D. safe 7. My English teacher often drives his car _______on the way to school. A. careless B. caring C. carefully D. careful 8. The bus is the main public _______ in Vietnam. A. travel B. tricycle C. transport D. vehicle 9. Give a _______ before you turn left or right. A. sound B. signal C. turn D. sign 10. When there is a traffic jam, it _______ me a very long time to go home. A. takes B. costs C. lasts D. spends 11. Hurry up or we can’t _______ the last bus home. A. keep B. follow C. go D. catch 12. We should _______ the street at the zebra crossing. A. walk B. walk on C. walk cross D. walk through 13. Cyclists and motorists have to wear a _______ when they ride a motorbike. A. hard hat B. cap C. mask D. helmet 14. You are allowed to walk on the _______. A. pavement B. road sign C. fork D. crossroad 15. Big cities often suffer from _______ in the rush hour. A. traffic signs B. traffic congestion C. breakdown D. accident 16. This young _______ has made four films so far. His recent film has won the Oscar for Best Director. A. actor B. actress C. director D. scriptwriter 17. The main _______is played by Tom Hanks. A. character B. director C. actress D. film maker 18. This film contains some _______ of violence. A. screens B. sceneries C. scents D. scenes 19. There is a love story in it, and it is very funny. I suppose you call it a _______. A. horror film B. action film C. romantic comedy D. thriller 20. The film is only 90 minutes _______ but it is very interesting. A. length B. long C. short D. shortness 21. What do you know about the main _______ of Yellow flowers on the green grass? A. directors B. characters C. scriptwriter D. film makers 22. Mr. Bean’s Holiday is a _______ film – I was laughing from beginning to end. A. hilarious B. moving C. scary D. violent 23. A _______ is a play in a theater or on television or radio, or plays and acting generally. A. comedy B. drama C. action D. film 24. We found the plot of the film _______. A. bored B. boring C. acting D. interested 25. We are really _______ about going to the cinema tonight. A. excited B. interested C. amused D. pleased 26. A film in which strange and frightening things happen is called a/an _______. A. thriller B. comedy C. drama D. animation 27. In Titanic, it _______ Leonardo DiCaprio as Jack Dawson, a poor artist. A. directs B. shows C. acts D. stars 28. The Vietnamese people _______ the New Year on the first three days of January according to the lunar calendar. A. perform B. celebrate C. take place D. host 29. The festival _______ every year at the end of August. A. takes B. takes place C. occurs D. held 30. He’s having a party in _______ of his 84 th birthday. A. ceremony B. celebration C. anniversary D. memory

viết đoạn văn ngắn về 1 vị anh hùng dân tộc có công lao to lớn trong sự nghiệp bảo vệ đất nước

Trình bày suy nghĩ của anh/chị về câu nói của Steve Jobs "tương lai được mua bằng hiện tại".

So với da ếch đồng và da cá thì da thằn lằn có đặc điểm