Tìm tất cả các gái trị của tham số m để \(e^x\left(x^2-x-1\right)=m\) có nghiệm trên [0;2]

Cho đồ thị hàm số \(y=x^3-3x^2+2\) có đò thị là (C). Tìm tọa độ điểm M thuộc (C) sao cho tiếp tuyến của đồ thị (C) tại M song song với đường thẳng (Δ): \(y=9x+2\)

Tìm m để hàm số \(y=2x^3+3\left(m-1\right)x^2+6\left(m-2\right)x+3\) nghịch biến trên khoảng có độ dài lớn hơn 3

Viết các phương trình phản ứng theo các sơ đồ sau ( viết dạng CTCT ghi rõ điều kiện phản ứng)

a, natri axetat -> metan -> axetilen -> benzen -> brombenzen -> natri phenolat -> phenol -> axit picric

b, axetilen -> etilen -> ancol etylic -> dietyl ete

c, Tinh bột -> glucozơ -> ancoletylic -> etilen -> etylclorua -> ancoletylic -> etilen

Tìm lỗi sai

1.The Post Office, (that is) a retail company in the United Kingdon; (formerly part) of (the postal service) Royal Mail,

(became) a separate entity in 1981

2. In 1823, the Post office (used) steamboats (to carry) mails and parcels (between) post towns (which) no roads existed

3. On February 22, 1921, (when) mail (was flown) both day (and) night (for the first time)

4. In 1930, (more than) 10000 trains (which were used) (for moving) the mail into every city, town, and village (in the United States)

5. (When) railroad mail service began, mostly letters (were sorted) on the trains, (which) (were not equipping) to distribute other kinds of mail

Read the passage carefully and choose the correct answer.

Even where there is an efficient 'door – to – door' delivery system, there are additional advantages in using Post Office (PO) boxes. There are certain conveniences for using PO boxes.

PO boxes allow mail to be pick up when sorted, rather than when it is delivered to the physical address, which will be hours later.

A mail user who regularly receives large parcels or items that must be signed for may find it convenient to pick up the rest of the mail at the same time.

A mail user who moves frequently can keep a mailing address.

A mail user may desire a more famous or prestigious address. For example, in Washington, D.C., many large P.O. box facilities are located near or even outside city limits.

A business receiving large volumes of mail may maintain separate post office boxes for separate departments, such as one for sales, one for customer service, to reduce the need to sort internally.

PO boxes are more secure than many home mailboxes, preventing mail theft and identity theft.

If you live on a boat, PO boxes can serve as your address, but are not necessary.

36. A PO box is more convenient for a mail user who frequently moves.

a. True b. False c. No information

37. If you use a PO box, you can get your mail earlier than you use a door-to-door delivery system.

a. True b. False c. No information

38. Home mailboxes are surely opened by mail thieves.

a. True b. False c. No information

39. Each business can rent only one PO box.

a. True b. False c. No information

40. If you live on a boat, the post office does not allow you to rent a PO box.

a. True b. False c. No information

Choose a, b, c, or d that best completes each unfinished sentence; substitutes the underlined part; or has a close meaning to the original one.

6. Mrs. Pike has just bought some kitchen ______ for her new house.

a. equip b. equipped c. equipment d. equipping

7. Thank you for phoning when I was ill. It was very ________ of you.

a. think b. thought c. thoughtful d. thoughtfully

8. Thanks to the progress of science and_____, human life has become better and better.

a. technology b. technological

c. technologically d. technician

9. I would like to send these letters __________ air mail.

a. in b. with c. by d. over

10. Could you please provide us _________ some more modern equipment?

a. for b. by c. in d. with

11. How far is your house away _______the city center?

a. in b. for c. at d. from

12. ________ fax transmission is commonly used in most offices.

a. A b. An c. The d. 0

13. That post office provides us with _________best services with well-trained staff.

a. the / a c. 0 / the c. a / the d. the / 0

14. He was a kind and courteous mailman.

a. polite b. strict c. unpleasant d. rude

15. Without more training or advanced technical skills, they'll lose their jobs.

a. out of date b. backward c. up to date d. old

16. There was a parking area to cater for the tourist trade,

a. thoughtful b. courteous c. possible d. spacious

17. Newspapers and magazines are often delivered early in the morning.

a. offered b. given c. provided d. distributed

18. Because the doctors and nurses acted properly and quickly, the baby was operated successfully.

a. cheaply b. promptly c. conveniently d. usefully

19. If you want to send a document and do not want to lose its original shape, our _______facsimile service will help you.

a. post b. express c. parcel d. fax

20. She had been assisted by a stranger ________her motor and drove her to safety.

a. who started b. whom starting

c. starting d. that will start I

21. With our senses, we perceive everything ___________

a. is around us b. that is around us

c. whom is around us d. whose is around us

22. The volunteers, _________ enthusiasm was obvious, finished the work quickly.

a. who b. whom c. whose d. that

23. The musicians __________yesterday have played together for many years.

a. to who we listened b. who we listened to

c. to that we listened d. to whom we listened

24. Many scientists have claimed that _________ like music are often good at mathematics.

a. children b. children who c. children whom d. whose children

25. The student ___________ had an impressive record.

a. the prize was awarded b. that the prize was awarded

c. to whom the prize was awarded d. who the prize was awarded

26. Those _______ have used our services for more than one year can enter the competition.

a. who b. whom c. which d. whose

27. I think it was your Dad ________

a. phoned b. phoning c. that phoned d. which phoned

28. That man is a newcomer in our company. Do you know him?

a. That man is a newcomer in our company. Do you know whom?

b. That man who is a newcomer in our company. Do you know him?

c. Do you know him that man is a newcomer in our company?

d. Do you know that man who is a newcomer in our company?

29. Yesterday I went to _________ I had never been to before.

a. Thanh Ba Post Office, that b. Thanh Ba Post Office where

c. Thanh Ba Post Office which d. Thanh Ba Post Office, which

30. She has two grown children, both of_________ live abroad.

a. who b. whom c. that d. whose

Choose a, b, c, d that best completes each unfinished sentence; substitutes the underlined part; or has a close meaning to the original one.

6. Laws have been introduced to prohibit the killing of endangered animals.

a. advised b. decreased c. ban d. encouraged

7. Hunting for meat and burning forests for soils _________ wildlife.

a. protect b. conserve c. destroy d. survive

8. National Parks are established to create the environment for rare animals to survive and ______offspring.

a. produce b. supply c. increase d. offer

9. The World Wild Funds is working to protect and save the forests that are ________ in

a. danger b. interest c. encouragement d. consequence

10. Scientists think it unlikely that the species will actually become ex­tinct as a _______ of the oil spill.

a. respect b. consequence c. protection d. production

11. Human beings can exist without water and air.

a. result b. live c. kill d. change

12. Do you know exactly ______ number of Siberian tigers in China?

a. a b. an c. the d. 0

13. Garbage is considered to be some kind of_______

a. pollute b. pollutants c. pollution d. polluting

14. Because of forest destruction some rare animals cannot survive, left alone _______

a. produce b. production c. productive d productivity

15. The people in our village are leading a _________life.

a. a. peace b. peaceful c. peacefully d. peacefulness

16. Human beings are changing the environment _________ all respects.

a. at b. for c. in d. upon

17. Air pollution interferes_______ our body's ability to process oxygen.

a. with b. on c. to d. over

18. We should do something immediately to save many kinds of rare animals _________extinction.

a. away b. from c. in d. with

19. I personally think that it is easy to understand ______ time is relative

a. the reason b. the reason for that

c. for which reason d. the reason why

20. ________concerns about wildlife never keeps a wild animal as pest.

a. Anyone that b. Anyone which

c. Anyone for whom d. Anyone those

21. Did you listen to the lecture on the environment by Dr. Pike,______

a. whom I have ever told you about b. about that I have ever told y

c. I have ever told you d. that I have ever told you

22. _____want to use rain forests are cutting them down without any hesitation

a. People who b. People which

c. People-whom d. Who

23. The man showed us the cage _________he kept a fierce lion.

a. Which b. that c. in which d. in that.

24. Those villagers _________near the forest chop down hardwoods 'to sell for high prices,

a. live b. who live c. whom live d. for whom to live

25. We have just had an exploration through that forest _________.

a. which some pandas survive b. where. there are some pandas surviving

c. in which there are some pandas survive d. that. some pandas survive

26. By cutting down the trees, people destroy the ecosystem of the rain forest ________

a. on. which they depend b. where they depend on

c. which they depend d. where they depend

27. _____comes from thousands of factories has caused enormous in­ creases in air pollution levels.

a. Smoke b. Smoke for which c. Smoke that d. Smoke whose

28. The areas ______are destroyed suffer a lot from soil erosion.

a. which trees b. whose trees c. that trees d. trees which

29. I will never forget the time _____ I first visit Cat Tien National Park..

a. when b. why c. where d. on that

30. Those scientists are doing research on the period the Earth formed.

a. where b. on that c. when d. why

Choose the best sentence that can be made from the cues given.

31. yesterday / I / go / Thanh Ba Post Office / send some money / my brother / the city

a. Yesterday I went to Thanh Ba Post Office where to send some money to my brother who was in the city.

b. Yesterday I went to Thanh Ba Post Office to send some money to my brother in the city.

c. yesterday when I went to Thanh Ba port Office sending some

money to my brother in the city.

d. Yesterday I went to Thanh Ba Post Office and sending some money to my brother in the city.

32. I/ arrive / 7 am / the post office / open

a. When I arrived at 7 am., the post office which had just been opened.

b. When I arrived at 7 am., the post office had just been opened.

c. I arrived at 7 am., when the post office had just been opened.

d. I arrived at 7 am., at the time the post office had just been opened.

33. the staff / help / me / send the money / very helpful and courteous.

a. the staff helped me to send me the money were very helpful and courteous.

b. the staff that helped me to send the to the money which were very helpful and courteous.

c. the staff whom helped me to send the money were very helpful and courteous.

d. the staff that helped me to send the to send the money were very helpful and courteous.

34. the service / good / only two hours later / my brother / phone / he had received the money

a. the service was so good that only two hours later my brother phoned me to say that he had received the money.

b. The service which was such a good that only two hours later my brother phoned me to tell that he had received the money.

c. the service was such good that only two hours later my brother phoned to tell he had received the money.

d. the service was so good that only two hours when my brother phoned to tell that he had received the money.

35. I / satisfied / the service / Thanh Ba post Office

a. I was satisfied with the service of Thanh Ba Post Office.

b. So that, I was satisfied with the service of Thanh Ba Post Office.

c. Nevertheless, I was satisfied with the service ofThanh Ba Post Office.

d. I was satisfied with the service of Which Thanh Ba Post Office.

Nhập từ bàn phím 2 số nguyên a và b. Tính tổng a và b và ghi kết quả ra tệp "Ketqua.txt"