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5 tháng 4 2022

hình như sai đề á bn

=404 BAN OI NHE

6 tháng 4 2022

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a) Do \(MC=2MB\) nên \(MC=\dfrac{2}{3}BC\)

Ta có \(S_{AMC}=\dfrac{2}{3}S_{ABC}=\dfrac{2}{3}.60=40\left(m^2\right)\)

b) Do N là điểm chính giữa AM nên \(MN=\dfrac{1}{2}AM\)

Ta có \(S_{CMN}=\dfrac{1}{2}S_{AMC}=\dfrac{1}{2}.40=20\left(m^2\right)\)

\(S_{BMN}=\dfrac{1}{2}S_{ABM}=\dfrac{1}{2}.\left(60-40\right)=10\left(m^2\right)\)

Do đó \(S_{BCN}=S_{CMN}+S_{BMN}=20+10=30\left(m^2\right)\)

6 tháng 4 2022

Số con đực trong đàn là: \(1200:\left(3+5\right)\times3=450\) (con)

Số con cái trong đàn là: \(1200-450=750\) (con)

6 tháng 4 2022

Giá tiền mỗi chiếc xe đạp cần tăng thêm là:

\(1.200.000×12\%=144.000\left(đồng\right)\)

Cửa hàng phải bán chiếc xe đạp đó với giá là:

\(1.200.000+144.000=1.344.000\left(đồng\right)\)

Đáp số: \(1.344.000đồng\)

6 tháng 4 2022

Để được lãi 12% thì cửa hàng cần bán với giá là: 

\(120000\times\left(1+12\%\right)=134400\) (đồng)

5 tháng 4 2022

Xe khởi hành lúc:

\(8h-72,5:29=5h30'\)

5 tháng 4 2022

Ta lấy:diện tíchx2:(đáy lớn+đáy bé)với điều kiện phải cùng đơn vị đo.

Chúc học tốt! 

21. It’s hard to believe that this film ____ completely by computer.                                 A. has been generated                                             B. has generated       C. was been generating                                           D. was to generate 22. I wish my father had bought me a new mobile phone instead of having it ____ like...
Đọc tiếp

21. It’s hard to believe that this film ____ completely by computer.                          

      A. has been generated                                             B. has generated

      C. was been generating                                           D. was to generate

22. I wish my father had bought me a new mobile phone instead of having it ____ like that.

      A. to repair                   B. repaired                         C. repairing                        D. being repaired

23. Smith _______ an actor years ago.                                                                     

      A. is said to be                                                          B. was said being             

      C. was said have been                                             D. is said to have been

24.In the US the first stage of compulsory education _______ as elementary education.

      A. to be generally known                                        B. is generally known      

      C. generally known                                                 D. is generally knowing  

25.Although he tried his best, he could not make his voice _______.                

      A. to be heard              B. to hear                            C. hearing                           D. heard

26.The preparations _______ by the time the guests _______.                            

      A. had been finished / arrived                               B. have finished / arrived

      C. had finished / were arriving                              D. have been finished / were arrived

27. As students _______ to study remotely from home, away from on-campus welfare and

support, taking their studies and exams online, they are increasingly becoming prey to essay mills.

      A. have forced             B. were being forced         C. have been forced          D. had been forced 28. Something _______ immediately to prevent teenagers from _______ in factories and mines.

      A. should be done / being exploited                     B. we should do / exploiting

      C. should do I be exploited                                    D. should have done / exploited

29. Thousands of lives lost to air pollution, inactivity and unhealthy diets ________ each year if the UK takes the action needed to tackle climate change.

      A. couldn’t be saved   B. could save                      C. could be saving            D. could be saved

30. No longer _______ in our office since it _______.

      A. have typewriters been used / computerized 

      B. typewriters have been used / was computerized

      C. have typewriters been used / was computerized

      D. typewriters have been used / computerized

31. While there’s disagreement over its origins, the caste system _______ in a legal treatise called Manusmriti, dating from about 1,000 B.C.                                                             

      A. had been formalized                                          B. was formalized            

      C. has been formalized                                           D. is formalized

32.The little girl started crying. She ____ her doll and no one was able to find it for her.

      A. has lost                    B. had lost                          C. was losing                     D. was lost

33.The pilot project is believed _______ emissions, noise pollution and damage to road

surfaces.                                                                                                                                

      A. to be reduced          B. to reducing                    C. to reduce                        D. to have been reduced

34. The first movie – length cartoon ______________, “Snow White and the Seven Dwarfs;”set the standard for later full-length features such as “The Lion King” and “Pocahontas”.

      A. that released ever   B. which ever released     C. ever released                 D. released whatever

35. Surely the virtual elimination in our society of most fatal diseases, rising life-expectancy and falling mortality ______ us up?

      A. should be cheered                                               B. should be cheering

      C. should is cheering                                               D. should have been cheered

36. Today more than twice as many tabloids _____ than the so-called “quality press” titles such as The Times or The Guardian.

      A. have been sold       B. are sold                          C. had been sold               D. will be sold

37. It ________ that cyberspace institutions or online universities will replace traditional educational establishments.

      A. anticipates               B. has anticipated              C. is anticipated                D. will be anticipating

38. Virtual classrooms ______ towards promoting the acquisition of knowledge as a lifelong endeavour, which occurs through global collaboration.

      A. will be geared         B. will gear                         C. is geared                        D. gear

39. Such terrible acts of child abuse ________ thanks to the continuing protests of the online community.

      A. were ignored          B. won’t ignore                  C. were not ignored          D. are ignored

40. I will never forget _______ to the Royal Garden Party, where superb cuisines were served amid luxurious surroundings.

      A. inviting                    B. to invite                          C. to be invited                  D. being invited

41. His responsibilities ________ welcoming visiting dignitaries from foreign countries.

      A. included                  B. were included               C. will be including          D. had been included 42. Though most fairy tales have happy endings, the stories usually deal with frightening situations - children ______ in the forest, terrifying giants, cruel stepmothers.

      A. are abandoned        B. abandoned                     C. will abandon                 D. had abandoned

43. __________ long thought to have no bones, small amounts of bone were recently found at the bases of the teeth in some species.

      A. Although sharks were                                        B. Despite sharks being

      C. In spite of sharks are                                           D. Nevertheless, sharks

45. Humans are pumping water out of the ground faster than it ________.

      A. can’t be replenished                                           B. can be replenished

      C. can replenish                                                       D. can have been replenished

46. When archaeologists discovered the ruins of the Olympic Stadium, interest in the Games__________.

      A. was renewed          B. were renewed               C. they were renewed      D. renewed

47. Most people are unable to discern a difference between the usual city drinking water and the treated wastewater, although it is actually _______ for industrial purposes.

      A. intending                 B. being intend                  C. have intended               D. intended

48. Visitors must sign in and show identification before ________ into the building.

      A. allowing                  B. being allowed               C. having allowed            D. to be allowed

49. The party _______ when she left.                                                                      

      A. had no sooner started                                         B. had hardly been started      

      C. had hardly started                                              D. had no sooner been started

50. It ______ that children are frequently better at recalling televised stories they have

watched compared to those they have simply heard.                                         

      A. has been noted       B. been noted                     C. is noting                         D. notes

MÌNH CẦN GẤP

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16 tháng 4 2022

ultr, hỏi mấy câu khó thoy chứ dài dữ ai làm gấp đựt