giải phương trình \(\left(\sqrt{2}+1\right)x^3-\sqrt{2}x^2-x=0\)

đề bài ở dưới ạ mong các a c đừng giải theo cách vi et nhé e cảm ơn trước

CM \(x-\sqrt{x}-1\ge0\forall x\)

In early days no medical college took a woman student. Elizabeth Blackwell, however, was determined to become a doctor. The young American wrote again and again to a number of medical colleges, asking if she could be enrolled but each time the answer was NO.

Then one day, to her surprise, she got a letter from the dean of a college in Geneva, which said YES.

At first Geneva College, like the other colleges, was not willing to enroll Elizabeth. But later the important people of that college learned that Elizabeth’s application had the support of a famous doctor, and they were afraid to offend that man.

So the dean decided to play a trick by turning the matter over to the student’s general meeting of the college, thinking that the students would be the last to agree to take Elizabeth.

When the boy students met, most students took no interest in the matter. Of the rest, some considered the young American’s idea interesting and some thought by having Elizabeth they would be proud of their college training the world’s first woman doctor. Very soon the students all agreed to accept Elizabeth.

The dean of Geneva College was of course very sorry to learn this, but seeing that he could do nothing to keep Elizabeth out, he gave in.

1. Elizabeth was surprised by the dean’s letter, because it promised her to_________.

A. have free medical education. B. go to Geneva C. become a student in his college D. go to Italy

2. At first Geneva College________accepting Elizabeth.

A. did not consider B. thought about C. was interested in D. was not aware of

3. When the student boys met to consider Elizabeth’s application,_________.

A. most students were serious B. many of the students showed no interest in the matter

C. most students took interest in the matter D. most of the students were no joking

4. Some students thought if they let Elizabeth join them they could make_________.

A. her proud B. the dean proud C. Geneva College proud D. him proud

5. The dean was very sorry when he saw his trick________.

A. worked B. continued C. succeeded D. failed

1. This machine _______ used since last week.

A. has been B. is C. was D. will be

2. If he _______ hard, he will pass his math test next week.

A. study B. studies C. studied D. is studying

3. We _____ go swimming together when we ______ in the village.

A. used to/lived B. used to/live C. are used to/lived D. get used to/lived

4. My brother got wet ________ he didn’t bring the umbrella with him.

A. but B. so C. because D. and

5. Mai made a big beautiful cake _______ her mother’s birthday.

A. by B. in C. at D. on

6. They say that solar energy doesn’t cause _________.

A. pollution B. pollute C. polluted D. pollutant

7. Peter fell over while he _______ basketball.

A. is playing B. was playing C. played D. plays

8.The people _______ live in England speak English.

A. whom B. which C. who D. whose

9. Be _______! He is looking at you.

A. carefully B. care C. careful D. carelessly

10. According to the weather _______, it will be raining tonight.

A. forecasting B. forecasted C. forecaster D. forecast

11. Jane speaks English _______ than you do.

A. more fluently B. more fluent C. more faster D. more better

12. Let’s go out for a walk, _________ ?

A. don’t we B. do we C. shall we D. will we

13. He made an interesting speech in the opening _______.

A. competition B. ceremony C. preparation D. solidarity

14. Due to the bad weather, the flight to Manchester was _______.

A. taken off B. cut down C. turned down D. put off

15. We lost the match _________ we played well.

A. but B. and C. because D. although

16. Auld Lang Syne _________on New Year’s Eve.

A. sang B. sings C. is to sing D. is sung

17. I visited the city _________my father talked about.

A. where B. which C. what D. it

18. I congratulate Mai _________passing the exam.

A. about B. in C. for D. on

19. It took hours to free the victims _________the collapsed buildings.

A. for B. in C. from D. away

20. It’s late. It’s time for me _________home.

A. going B. went C. to go D. go

21. I like _________on the beach. I always spend my holiday _________.

A. to lie/ to sunbath B. lying/ to sunbath C. lying/ sunbath D. lying/ sunbathing

22. We must learn English at school. It’s a(n) _________subject.

A. primary B. compulsory C. national D. optional

23. There is a river _________across the village.

A. running B. lying C. flowing D. reaching

24. They put _________the blanket and laid _________food.

A. in/ on B. down/ over C. down/ out D. on/in

25. It’s very crowded here. I wish _____________________.

A. there were a few people B. there is no one C. there weren’t so many people D. there was somebody here.

26. When I rang Tessa sometime last week, she said she was busy _________.

A. today B. that day C. this day D. the day

27. The teacher asked me ______ a passage into Vietnamese.

A. translate B. to translate C. translating D. translated

28. Be quiet, please. The head master would like to _________a few words.

A. talk B. say C. tell D. mention

29. I’ve known him _________I left school.

A. when B. before C. until D. since

30. Maria’s English is excellent. She speaks English __________.

A. very perfect B. perfective C. perfectively D. perfectly

1. We went to the airport to _______ off a friend who was leaving for London.

A. tell B. say C. join D. see

2. Tam has a big_______ of foreign coins.

A. collector B. collection C. collecting D. collective

3. If we don’t_______ on electricity, there will be power cut.

A. economic B. economics C. economical D. economize

4. I’ve always enjoyed traveling. My mother, _______, prefers to stay at home.

A. bit B. although C. however D. moreover

5. I’ll give you a lift to the station if_______ in a hurry.

A. you’re B. you were C. you’ll be D. you’d be

6. If Lan comes to England, it will be a good_______ for her to improve her English.

A. opportunity B. possibility C. advantage D. experience

7. We decided not to go out for meal _________ we were too tired.

A but B. because C. so D. and

8. My shoes are dirty. I’d better take them ________before I come in.

A. away B. up C. on D. off

9. If you want to save money, you should ________the amount of water your family uses.

A. increase B. reduce C. adapt D. repair

10. Who is going to __________ your children when you’re at work?

A. look for B. look up C. look after D. look out

11. Mary’s eyes are weak, __________, she has to wear glasses.

A. but B. however C. and D. therefore

12. If there is a mechanical problem, we suggest _________ the manufacturer directly.

A. contact B. contacting C. to contact D. be contacted

13. Our energy will soon come to an end if we don’t__________ it.

A. use B. save C. spend D. take

14. The children like to put ___________ nice clothes when they go out.

A. in B. off C. into D. on

15. I like bananas, __________my brother doesn’t.

A. because B. but C. and D. even though

16. Please turn __________ the gas. I want to cook my lunch.

A. over B. on C. in D. over

17. He is tired ________ he stayed up late watching TV.

A. so B. because C. but D. and

18. Can you turn ................ the light? It's too dark.

A. on B. off C. in D. for

19. What are you looking ..................... ? .My picture book. I've lost it.

A. for B. off C. in D. on

20. There are ............ saving methods and inventions to use solar energy.

A. energy B. energize C. energetic D. energetics

21. I had to pay much money this month for the international………………..

A. calls B. calling C. call D. called

22. A new air-conditioner will be ................... this morning.

A. installed B. to install C. installing D. to install

23. Scientists are looking for an ..................... way to reduce energy consumption.

A. effective B. affection C. effect D. effectively

24. We can ______ easily in the daylight.

A. read B. to read C. reading D. readed

25. She won’t take all these suitcases______ she likes to travel light .

A. because B. but C. so D. therefore

26. They are completely short of water now. A number of people have died because of this____

A. shortage B. short C. shorten D. shortly

27. She is very tired. ______,she has to finish her homework.

A. however B. so C. and D. moreover

28. Is he an actor ______ singer?

A. or B. and C. with D. so

29. He’s tired ______ he took a rest before continuing the work.

A. so B. and C. but D. if

30. She forgot ______ off the gas before going out.

A. turning B. turn C. to turn D. turned

31. I suggest ______ money for the poor people in our neighborhood.

A. saving B. to save C. save D. saved

32. Who looks ______ your children when you are away from home?

A. after B. at C. for D. to

33. We decided not to go out for meal ______ we were too tired.

A. but B. because C. so D. and

34. I can’t understand the French visitors. I wish I________French.

A. knew B. will know C. know D. have known

35. The church________about 100 years ago.

A. is built B. was built C. will be built D. has been built

36. People in Israel are going to celebrate their festival________is called Passover.

A. whose B.who C. which D. where

37. ________I was really tired , I couldn’t sleep.

A. Even though B. So C. Therefore D. Because of

38. Lan is very tired. ________, she has to finish her assignment before going to bed.

A. Although B. So C. Therefore D. However

39. I suggest________some money for poor children.

A. raise B. to raise C. raised D. raising

40. She asked me if I________a laptop computer the following day.

A.buy B. will buy C. bought D. would buy

41. I ________telephone her if I knew her number.

A. would B. have to C. will D. shall

42. Honda motorbikes________in Viet Nam.

A. produce B. will produce C. are produced D. would be produced

43. We have learnt English________2001.

A. for B. since C. in D. during

44. We________already________Huong Pagoda.

A. were…seeing B. have…seen C. are…seeing D. will…see

45. All the houses in the area________immediately.

A. has to rebuilt B. had to rebuild C. have to be rebuilt D. have to rebuild

46. If he________soon, he might miss the train.

A. isn’t coming B. doesn’t come C. won’t come D. didn’t come

47. Mr. Long said that he________in Ho Chi Minh City.

A. lived B. is living C. has lived D. will live

48. Your sister works in a foreign company, ________she?

A. isn’t B. didn’t C.wasn’t D. doesn’t

When Scotsman Alexander Graham Bell (1) _________ the telephone in 1876, it was a revolution in communication. (2) _________ the first time, people could talk to each other over great distances almost as clearly as if they were in the same room. Nowadays, though, we (3) _________ use Bell’s invention for taking photographs, (4) _________ the Internet or watching video clips rather than talking. Over the last two decades a new (5) _________ of spoken communication has emerged: the mobile phone.

1. A. invented B. is invented C. invented D. was invented

2. A. As B. By C. For D. Since

3. A. increase B. increased C. increasing D. increasingly

4. A. accessing B. contacting C. entering D. searching

5. A. aids B. means C. tools D. ways