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I/ Choose the best options to complete the sentences .1.    My parents ____me to se Cham temple last summer.A. took     B. takes           C. take             D. to take  2. Hoa learned how____ a sewing machine.            A. using           B. use              C. used                        D. to use  3.  The dentist_____ a cavity in Mai’s tooth.           A. did  B. made           C....
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I/ Choose the best options to complete the sentences .

1.    My parents ____me to se Cham temple last summer.A. took     B. takes           C. take             D. to take

  2. Hoa learned how____ a sewing machine.            A. using           B. use              C. used                        D. to use

  3.  The dentist_____ a cavity in Mai’s tooth.           A. did  B. made           C. filled                       D. pulled

  4 .Life in Viet Nam is now__________ than in the past.

            A. comfortable            B. more comfortable                          C.comfortably D.more comfortably

 5. What kinds of___do you like?- I like folk music. A.sports  B.programs  C.books                      D.music

6. Fruit juice is good____our health.A.to       B.for                                        C.with                                     D.at

7.  Lan doesn’t like beef and_____ does her aunt.    A. so    B. too              C. either                      D. neither

 8. What’s your____?- I’m 45 kilos.      A. heavy       B. weight                    C. height                     D. weigh

 9. Most of the world’s surface is_____. a. mountain           B. land                        C. plant                       D. water

 10. They went to the zoo last Saturday and Minh did, ___ A. so     B. too  C. either                      D. neither

11. Students should take part___ outdoor activities.    A. in                         B. on   C. at                            D. for

12. You must be careful. Video games can be____A. interesting      B. happy          C. boring D. addictive

13. You ought_________ to the dentist.        A. to go   B. go           C. going                      D. to going

 14.  Would you like to drink a cup of coffee? -___________________.

            A. Yes, I do                B. No, I wouldn’t       C. Thanks, I’d love to             D. You’re welcome

 15 .What kinds of_____ do you like? - I like cartoons.A. books      B. Films C.pictures                 D.sports

 16. Are you free____ Sunday?          A.in     B.at                                        C.for                            D.on

17. They prefer reading books____ watching TV.A.to          B.than            C.with                         D.more

18.  She doesn’t like beef and I don’t,_______.    A. so        B. too              C. either                      D. neither

19. Mai went to the supermarket last Saturday and Lan did, ____A. so       B. too  C. either          D. neither

20.Minh’s tooth hurts ____ he has a cavity.A. because         B. and             C. or                            D. but

21. Tri Nguyen______ is a famous place in Nha Trang. A. temple    B. museum      C. Pagoda D. aquarium

 22.  Would you like___ a dinner with me tonight?.              A. have            B. to have        C. having         D. has

 23 .Ba____to school yesterday because he felt tired.A. doesn’t go B. didn’t go C.wasn’t goD.didn’t went

24. He prefers___ TV every night.     A.watched      B.watching                  C.watch                      D.watches

25. He is a good soccer player.He plays soccer very____A.well       B.goodly         C.badly           D.bad

 26. What kinds of___ do you like? – I like soup.       A. water         B. drinks         C. food            D. sugar

 27. What about______ to the movies?    A. go         B. to go           C. goes                        D. going

28. Mr Tan is a______ worker.    A. care                   B. careful        C. carefully                 D. carelesslly

29. He was busy yesterday and ___ were his brothers. A. So B. too             C. either                      D. neither  

30.They enjoy____ their kites in their free time.A. fly           B. flying          C. to fly                       D. flied

 31. You should ___your hands before meals.A. to wash      B. washing      C. wash                       D. washes

 32 .He prefers watching TV___ playing video games.A.to              B.for                C.with                         D.at

33. He is a ___soccer player. He plays soccer very well.A.well         B.bad              C.good                        D.badly

34.  I don’t like beef . My mother doesn’t_____    A. so       B. too              C. either                      D. neither

 35. We need some beef and chicken. Let’s go to the___stall. A. vegetable B. fruit            C. meat            D. 0

36. Mr Tan is a careful worker. He works ___    A. care        B. carefully     C. careful        D. carelesslly

37. What was wrong____you?A.to    B.for                                        C.with                                     D.at

38.Don’t forget to wash your____ before meals.A. teeth      B. hands          C. feet                         D. head

39. He _____ a bad cold and headache.         A. was             B. had             C. took                                    D. made

 40.  My brother is a ___ volleyball player.     A. skill             B. skillful        C. skillfully                 D. quick

 41 .She has ___________ of friends in Hue.A.many            B.few              C.lots                           D.lot

42. He is a careful driver. He drives____A.careful                B.carefully      C.goodly                     D.careless 43. How_____ is your brother? – He is 1.70 meters tall.       A. high      B. heavy          C. tall  D. weigh

44. The weather____ nice yesterday.      a. was        B. were                        C. did                          D. is

 45. Children shouldn’t eat too ___ candy.    A. a little         B. many           C. a few                      D. much

53. _____ swimming?- That’s OK.         A. How about         B. Let’s  C. Shall we               D. Why don’t we

54. I can’t go out for a walk now. I _my homework.  A. must doB. must to doC. must doing  D.must does

55.They__ Nha Trang last summer.   A. visit                        B. visitting                  C. visited                     D. to visit

  56. After the holiday, they returned to Ha Noi____ bus.                A. on               B. in    C. to                D. by

  57.  _____ do you brush your teeth?- Twice a day A. How  B. How much C. How often D. How long

  58 .What was_____ with her?A.matter        B.wrong                                  C.right                         D.problem

60. Are there good programs _____ teenagers?A.in              B.with             C.for                            D.at

61. Baseball is one of the_____ popular games.      A. more  B. many           C. much                       D. most

62. In____ amounts, sugar is good for your health.   A. many         B. muchC. moderate               D. few

63.Liz talked to Ba______her vacation in Nha Trang.A. about         B. on               C. in    D. with

64 .Hoa watched Mrs Mai ____ her dress.    A. made          B. make           C.to make                    D.making

69. My friend prefers watching video __________.

     A. to listening to music                  B. than listening to music       C. to listen to music D. listen to music

72.I don’t like coffee and___A. She doesn’t, too.B. so does Lan.  C. she doesn’t, either.   D.She does, either

73. I  ______sick last night.A. were               B. was                                     C. is                             D .did

75. She ______ the beef into thin strips.A.made                   B.heated                   C. sliced              D. took

76. _______you lend me your pen,please ?A.Would                B.can                 C. Should                 D. Do

77. ______?-I’m one meter fifty centimeters tall.      A. What is your weight ?B. How height are you ?  C. What is your height ?  D. How heavy are you

78. Your  _____  is 37 0C.      A.height                  B.weight                            C. temperature         D. tall

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1. what will intention you wear to the party tommorrow?

2. I won't arrangement anything this evening

3. go and ask Amy- I'm sure she known prediction

4. Our teacher took arrangement us on a museum visit next week.

4 tháng 3 2020

a)\(15\cdot2^3\cdot\left(-2\right)^3\cdot3^3=-25920\)

b)\(\frac{-1}{3}\cdot1^2\cdot\left(-\frac{1}{2}\right)^3\cdot\left(-2\right)^3=\frac{-1}{3}\)

c)\(\frac{2}{5}a\cdot\left(-3\right)^3\cdot\left(-1\right)^6\cdot2=\frac{-108}{5}a\)

4 tháng 3 2020

Để C(x) có nghiệm

\(\Leftrightarrow8x^3-2x=0\)

\(\Leftrightarrow2x\left(4x^2-1\right)=0\)

\(\Leftrightarrow x\left(2x-1\right)\left(2x+1\right)=0\)

\(\Leftrightarrow x\in\left\{0,\frac{1}{2},-\frac{1}{2}\right\}\)

4 tháng 3 2020

\(\frac{x-2016}{100}+\frac{x-2014}{102}+\frac{x-2016}{104}+...+\frac{x-2}{2114}=1008\)

\(\Rightarrow\frac{x-2016}{100}-1+\frac{x-2014}{102}-1+...+\frac{x-2}{2114}-1=0\)

\(\Rightarrow\frac{x-2116}{100}+\frac{x-2116}{102}+...+\frac{x-2116}{2114}=0\)

\(\Rightarrow\left(x-2116\right)\left(\frac{1}{100}+\frac{1}{102}+...+\frac{1}{2114}\right)=0\)

mà \(\frac{1}{100}+\frac{1}{102}+...+\frac{1}{2114}\ne0\)

\(\Rightarrow x-2116=0\)

\(\Rightarrow x=2116\)

4 tháng 3 2020

P/s màu mè ghê ha =))

\(\frac{x-2016}{100}+\frac{x-2014}{102}+...+\frac{x-2}{2114}=1008\)

\(=>\frac{x-2016}{100}+\frac{x-2014}{102}+...+\frac{x-2}{2114}-1008=0\)

\(=>\frac{x-2016}{100}-1+\frac{x-2014}{102}-1+...+\frac{x-2}{2114}-1=0\)

\(=>\frac{x-2116}{100}+\frac{x-2116}{102}+...+\frac{x-2116}{2114}=0\)

\(=>\left(x-2116\right).\left(\frac{1}{100}+\frac{1}{102}+...+\frac{1}{2114}\right)=0\)

Do \(\frac{1}{100}+\frac{1}{102}+...+\frac{1}{2114}\ne0\)

\(=>x-2116=0\)

\(=>x=2116\)

4 tháng 3 2020

Viết phương trình dưới dạng :

\(\left(\frac{2}{5}\right)^x+\left(\frac{3}{5}\right)^x=1\left(1\right)\)

+)Với \(x=0\) thì vế trái của \(\left(1\right)\) bằng \(2\) \(,\) loại

+)Với \(x=1\) thì vế trái của \(\left(1\right)\) bằng \(1\) \(,\) thỏa mãn

+)Với \(x\) \(\geq\) \(2\) thì \(\left(\frac{2}{5}\right)^x< \frac{2}{5};\left(\frac{3}{5}\right)^x< \frac{3}{5}\) nên:

  \(\left(\frac{2}{5}\right)^x+\left(\frac{3}{5}\right)^x< \frac{2}{5}+\frac{3}{5}=1\) \(,\) loại

Vậy nghiệm duy nhất của phương trình là  \(x=1\)

4 tháng 3 2020

Rút gọn A trước khi tính :

\(A=\left(\frac{7}{2}x^4y^3-\frac{1}{3}x^4y^3\right)+\left(8x^2y^5-5x^2y^5\right)-\left(6y+\frac{1}{2}y\right)\)

\(=\frac{19}{6}x^4y^3+3x^2y^5-\frac{13}{2}y\)

Thay \(x=-2,y=\frac{3}{4}\) vào A có :

\(A=\frac{19}{6}\cdot\left(-2\right)^4\cdot\left(\frac{3}{4}\right)^3+3\cdot\left(-2\right)^2\cdot\left(\frac{3}{4}\right)^5-\frac{13}{2}\cdot\frac{3}{4}\)

\(=\frac{171}{8}+\frac{729}{8192}-\frac{39}{8}\approx16,6\)

:)) Số xấu ....

4 tháng 3 2020

Xét biểu thức A, ta suy ra:

\(A=\frac{19}{6}x^4y^3+3x^2y^5-\frac{-13}{2}y\)

Tại x=-2 và y=3/4 thì:

\(A=\frac{19}{6}\cdot\left(-2\right)^4\cdot\left(\frac{3}{4}\right)^3+3\cdot\left(-2\right)^2\cdot\left(\frac{3}{4}\right)^5-\frac{-13}{2}\cdot\frac{3}{4}\)

(phần này bạn tự tính)

\(\)

4 tháng 3 2020

Gọi số sách 3 tủ lần lượt là a,b,c

Trước và sau khi chuyển thì tổng số sách 3 tủ vẫn là 2250 cuốn. 

Theo đề bài, ta có:

a+b+c=2250

Sau khi chuyển thì: \(\frac{a}{16}=\frac{b}{15}=\frac{c}{14}\)

Áp dụng tính chất dãy tỉ số bằng nhau, ta có:

\(\frac{a}{16}=\frac{b}{15}=\frac{c}{14}=\frac{a+b+c}{16+15+14}=\frac{2250}{45}=50\)

Suy ra số sách trước khi chuyển:\(\hept{\begin{cases}a=50\cdot16=800+100=900\\b=50\cdot15=750\\c=50\cdot14-100=600\end{cases}}\)(quyển)

Vậy..