Phương trình sinu=m

Giải các phương trình sau:

1. sinx.cosx = 0

2. cosx + sinx = -1

3. sinx.cosx.cos2x = 0

4. sin²x - 4sinx + 3 = 0

5. sin2x + cos2x = 1

6. 2sin2x + 1= 0

7. sin (2x - 40⁰) =\(\frac{\sqrt{3}}{2}\) với -180⁰ \(\le\) x \(\le\) 180⁰

8. 2sinx + \(\sqrt{2}\) =0

Đường tàu hỏa từ Huế đến Hồ Chí Minh dài 1040km được làm từ vật liệu có hệ số nở dài của chất làm thanh ray là 12.10-6K-1. Khi nhiệt độ bằng 500C thì giữa các thanh ray không có khe hở, nếu khi nhiệt độ giảm còn 100C thì tổng chiều dài các thanh ray ngắn bớt gần bằng

A,499m B.299m C.125m D.520m

1.Cho 4.12 gam một muối natri halogen tác dụng hết với dd AgNO₃ thu được 7.52gam kết tủa. Halogen trong muối là?

A. Flo (19) B. Brom (80) C. Clo (35.5) D. Iot (127)

2. Khi cho 15.8 gam kali pemaganat tác dụng với axit clohidric đậm đặc thì thể thích clo thu được ở đktc là:

A. 5.0 lít B. 11.2 lít C. 8.4 lít D. 5.6 lít

3. Sục từ từ 2.24 lít SO₂ (đktc) vào 100 ml dd NaOH 1M. Muối tạo thành sao phản ứng là

A. Na₂SO3 B. NaHSO₃ C. Na₂SO₃ D. NA₂SO3 và NaHSO₃

Em hiểu biết gì về nho giáo?
Nho giáo đã tác động đến xã hội Việt Nam như thế nào?

Viết một đoạn văn ngắn trình bày cảm nhận của em vể câu nói " Tình yêu được thử qua lửa là tình yêu cao cả và đẹp nhất"

Một đoàn xe tải chở 180 tấn hàng từ cảng trở về kho, khi sắp bắt đầu chở thì 1 xe bị hỏng nên mỗi xe phài chở thêm 1 tấn và cả đoản chở vượt định mức 10 tấn. Hỏi đoàn xe lúc đầu có bao nhiêu chiếc?

Giúp mình với !!

6. The ________ second language in Malaysia is English.

A. primary

B. tradition

C. compulsory

D. instruction

7. The Ao Dai is the ________dress of Vietnamese women.

A. modern

B. convenient

C. traditional

D. most fashionable

8. Mrs Hoa will stay in London ________Monday ________ Friday.

A. between / to

B. from / to

C. on / until

D. on / to

9. It doesn’t rain ________ the dry season.

A. on

B. at

C. in

D. between

10. Nobody can finish that test on time, _______?

A. can’t they

B. can she

C. can he

D. can they

11. Mrs Baker has taught English in Hanoi_______ half a month.

A. for

B. at

C. since

D. during

12. I wish I _______ in your position.

A. was

B. will be

C. were

D. have been

13. He asked me if I _______ able to start the journey early the following day.

A. would be

B. were

C. will be

D. am

14. This summer resort is absolutely wonderful and I’d _______ it to any one.

A. recommend

B. talk

C. accommodate

D. praise

15. We had to walk since we couldn’t _______ to take a bus.

A. afford

B. be weathy

C. supply

D. furnish

16. Our life would be very difficult without _______.

A. luxury furniture

B. water

C. savings-labor machines

D. electricity

17. After retiring, my aunt spent her luxury on an expensive holiday.

A. dollars

B. accounts

C. saving

D. cheques

18. A lot of people left school at 16 and they now _______leaving so early.

A. sorry

B. regret

C. confuse

D. worry

19. Remember _______ the door before going to bed.

A. locking

B. to lock

C. locked

D. not locking

20. Nancy talks as if she _______ everythiong.

Đ THI CHÍNH TH C

ỀỨ

A. knows

B. knew

C. had known

D. not know

21. Many things which we can do now couldn’t _______ years ago.

A. do

B. done

C. being done

D. be done

22. When I first visited Moscow, I couldn’t get used to _______ the cold weather.

A. with

B. to

C. for

D. in

23. They insisted that she _______ the party.

A. attended

B. attends

C. to attend

D. attend

24. We can’t go wrong if we _______ the instructions.

A. follow

B. take

C. guide

D. keep

25. If you _______ mentioned it, nobody would ever have known.

A. shouldn’t

B. didn’t

C. hadn’t

D. wouldn’t have

26. A large number of inhabitantshave made _____ on how to protect the environment.

A. suggest

B. to suggest

C. suggested

D. suggestion

27. Mary put a _______ on the letter.

A. five-cents stamp

B. five-cent stamp

C. stamp of five cents

D. five-cent stamps

28. We quarrel _______ the choice of a house.

A. on

B. over

C. for

D. to

29. There were a lot of people at my friend’s wedding party last Sunday, only a few of _______ I had met

before.

A. who

B. whose

C. whom

D. which

30. You should have known that Anne could not keep a secret. Never again _______her anything.

A. will tell

B. will I tell

C. I tell

D. I will tell

31. It rains so _______ that we can’t go out now.

A. very hard

B. hard enough

C. hard

D. hardly

32. She had changed so much that _______ anyone recognized her.

A. almost

B. hardly

C. not

D. nearly

33. Would you like a beer? – Not while I’m _______.

A. in the act

B. in order

C. on duty

D. under control

34. Malaysia is divided _______ two regions.

A. to

B. into

C. in

D. on

35. The reason I left is _______ I was bored.

A. why

B. that

C. while

D. for

36. I came _______ an old friend while I was walking along the street.

A. across

B. into

C. up

D. for

37. Everyone _______ Tom was invited to the party.

A. as

B. from

C. but

D. for

38. The chemistry book _______ was a little expensive.

A. I bought

B. that I bought it

C. I bought that

D. what I bought

39. If you_______ to my advice in the first place, you wouldn’t be in this mess now.

A. listen

B. will listen

C. listened

D. hed listened

40. I am late because my alarm clock didn’t _______ this morning.

A. come on

B. ring out

C. go off

D. turn on

41. We have decided to _______ the money for the local secondary school.

A. beg

B. collect

C. raise

D. rise

42. She didn’t get _______ well with her boss, so she left the company.

A. at

B. on

C. through

D. up

43. I think you need to have _______.

A. your fridge repaired

B. repair you fridge

C. fridge repaired

D. repair your fridge

44. She used to work as a typist, _______ she?

A. did

B. didn’t

C. use

D. wouldn’t

45. There isn’t _______ foreign news in the paper.

A. a lot

B. lots

C. many

D. much

46. A person who can’t speak and hear is called _______.

A. a character

B. a deaf

C. a blind

D. a deaf-mute

47. Her room seemed warmer with nice _______ on the wall.

A. booth

B. poster

C. shelf

D. curtain

48. My parents will _______ their wedding anniversary next month.

A. make

B. celebrate

C. remember

D. promise

49. The meeting was _______ in the park last week.

A. revived

B. held

C. developed

D. joined

50. If you don’t understand many words, you can _______ them up in the dictionary on that table.

A. look

B. get

C. find

D. finish

51. The _______ in Vietnam usually begins in December and ends in July.

A. football match

B. football team

C. football fan

D. football season

52. He is a person who loves parties. He is always the first ______ and the last ______ .

A. to come / to leave

B. to come / living

A. coming / leaving

D. coming / to leave

53. There are _______ methods and inventions to use solar energy.

A. energy-saving

B. energy-saved

C. saved-energy

D. energy-save

54. Hello. Is that 21045? Please put me ________ to the manager.

A. across

B. through

C. over

D. up

55. So little ________ that the neighbors could not settle their differences.

A. they agreed

B. agreed did they

C. did they agree

D. they did agree

56. Which do you want, this pen or that one? – I want ________.

A. both

B. all

C. them

D. other

57. “ The last time I saw him was in 1999” means________.

A. I have usually seen him since 1999.

B. I have not seen him since 1999

C. i have not seen him for 1999

D. I saw him since 1999

58. It’s difficult to pay one’s bill when price keep ________.

A. raising

B. growing

C. gaining

D. rising

59. After ________ to make a speech at the ceremony, John stayed up late to write it down.

A. telling

B. having told

C. being told

D. has told

60. The dentist told him to open it mouth _________.

A. broad

B. ide

ư

C. broadly

D. idely

ư

61. Venice, ________ has o lot of old houses built on water, is a city in Italy.

A. where

B. which

C. that

D. whose

62. Twenty miles _________ a long way to walk.

A. are

B. was

C. is

D. were

63. The children enjoy ________ soccer after school.

A. to play

B. play

C. played

D. playing

64. Jenny said that she had to leave ________.

A. the following day

B. tonight

C. this afternoon

D. now

65. My sister has just bought a small house ________ of the town.

A. in the district

B. in the edge

C. in the suburb

D. on the outskirts

66. She forgot ________ off the gas before going out.

A. turning

B. to turn

C. turn

D. turned

67. My youngest brother always wanted to be an actor when she ________ up.

A. grew

B. brought

C. settled

D. came

68. If you like skiing, there’s ski ________ under an hour’s drive from Madrid.

A. station

B. resort

C. place

D. port

69. The word “jeans” comes from a kind of ________ that was made in Europe.

A. furniture

B. tool

C. material

D. clothes

70. I’d like to live somewhere by the Mediterranean ________ i love the sun.

A. because

B. because of

C. however

D. but

71. Bob told me he ________ that book.

A. read already

B. have just read

C. had read

D. already read

72. Danny was out when I came, ________ I left a message.

A. so

B. so that

C. such

D. such that

73. The guard told the prisoner ________.

A. not to smoke

B. to not smoke

C. not smoking

D. no smoking

74. Some of my friends are taking extra classes in English ________ become tourist guides.

A. so that

B. so as

C. in order to

D. so long to

75. Easter is a joyful festival which is________ in many country.

A. celebrator

B. celebrate

C. celebrating

D. celebrated

76. She could find the book _______ at the library_______ at the bookstore.

A. rather/than

B.so/as

C. such/as

D. neither/nor

77. After I _______ the grass, it _______ to rain.

A. have water/ will begin

B. water/ began

C. had watered/ began

D. had watered/ will have begun

78. He is the most effective _______ in the city.

A. action

B. act

C. activist

D. activity

79. I am _______ of making excuses for your rudeness to our friends.

A. annoyed

B. worried

C. tired

D. angry

80. Please don’t disturb me _______ there is something urgent.

A. if

B. or

C. otherwise

D. unless