Tìm GTNN:

B= 2x^2-14y+y^2-4x+16

Tìm GTNN

B= -14+2X^2+X

1. Tìm GTNN:

B= 3x^2-y+2y^2+x-11

1 ô tô chuyển động trên đoạn đường MN. nửa thời gian đầu ô tô đi với vận tốc 54km/h. Nửa thời gian sau ô tô đi với vận tốc 60km/h. Tính vận tốc trung bình của ô tô trên đoạn đường MN

2 xe chuyển động thẳng đều từ 2 địa điểm cách nhau 100km. Xe thứ nhất đi liên tục ko nghỉ vs vận tốc 20km/h. Xe thứ 2 khởi hành sớm hơn xe thứ nhất 30p nhưng dọc đường lại nghỉ 1 giờ. Hỏi xe thứ 2 phải có vận tốc bao nhiêu đê tới cùng lúc với xe thứ nhất? (tóm tắt đề giùm em luôn ạ)

Tìm GTNN:
A=5x^2 -x +2
B=3x^2 -y+2y^2+x-11      

6. The writer is still a young man. He wrote his last book in 1991, but he (not write) hasn't written anything since then.
7. Jane (live) lives in London. She (visit) is going to visitour new flat tomorrow. When she (come)come, she (get) will get a surprise because this is the nicest flat we have ever (have) had . We (meet) …are going to………her at the airport tomorrow morning and we (have) …will have………dinner at home. She (stay) ……will stay………for 2 days.
8. She hates (answer) ……answering………the phone and very often just lets it (ring). ……ring………
9. After (read) reading………this article you will give up (smoke) …smoking………and (drink) …drinking……
10. Don't forget (turn) to turn……...…off all the lights before (leave) …leaving…………the classroom.
11. I don't like (go) ……going………to a wedding. Are you afraid of (be) …being…………invited?
12. I caught him (climb) ………when he was climbing……over my wall. I asked him (explain) ……to explain………but he refused (say) …saying……anything so in the end I had (let) …to let……him (go) go……………
13. (Lie) ………Lying……on this beach is much more pleasant than (sit) …sitting…………in the office doing nothing.
14. The teacher (come) ……comes……into the classroom unusually early and one of the boys who (smoke) …smokes………a cigarette (have) ………has…no time to put it out. So he (throw) throws……………it into the desk and (hope) ……hopes……for the best. A little later the teacher (notice) notices……that smoke was rising from this desk.
15. The man (say) ……said………that they (work) …were working…………on the road outside my house and that they (want) wanted……………some water to make tea.
16. I can't find my text book, did you (see)see  it ?
     Yes, You (leave) left……it in the classroom yesterday, I have (put) …put…it back in your drawer.
17. We (arrive) ………arrived……in Rome at 10 o'clock yesterday morning. We (stay) ………stayed… in a nice little hotel not far from the city center, we have already (see) ………seen……St. Peter`s and tomorrow we (go) ……are going…on a trip to Pompei. I have(be) …been…………there before. I (go) …go……to Italy quite often when I (be) …was…………a child but it will be interesting to see if it (change) changes………… in anyway.
18. The driver (fall) …was falling…………asleep at the wheel before he had an accident.
19. A tent and a sleeping bag (be) …are…………the required equipment for camping.
20. Take a suit that (travel) ……………well.
21. The class (debate) ……is debating………among themselves at the moment.
22. The class (respect) …respected…………the teacher.
23. Don't phone after eight I (have) …am going to have…………a dinner party.
24. I'll let you know when he (arrive). …arrives…………
25. I suddenly felt an insect (crawl) …was crawling…………up my leg.
26. Nobody else understands her as well as he (do)does
27. What will you do when you (retire) …retire………… Bill?
28. I (finish) …will finish…………it by tomorrow.
29. If Lam passes his exam, he (go) …will go…………to university.
30. We (look) ………are looking……forward to having wonderful holidays in Vung Tau next month.
31. Do you hear (cry) …someone is crying…………softly in the next room?
32. My mother is good at (cook) …cooking

Exercise 3: Chọn câu trả lời đúng

1.In Vietnam, it is normally in the South than in the North.

A. hot B. hotter C. hottest D. hoter

2.The food is than the last time I ate it.

A. badder B. bad C. worse D. worst

3.Ho Chi Minh city is than Hanoi.

A. big B. bigger C. biggest D. biger

4.Her voice is than her sister’s.

A. beautiful B. more beautiful c. beautifully D. more beautifully

5.Her literature result is much than it was last year.

A. good B. well C. more well D. better

6.Cinderella danced than any other girls at the ball.

A. more graceful B. gracefuler C. gracefully D. more gracefully

7.This book is the of all.

A. bored B. boring C. more boring D. most boring

8.Mary speaks English very

A. fluent B. fluently C. more fluently D. most fluently

9.Tom runs faster than John and David runs the in the group.

A. fast B. most fast C. fastest D. most fastly 

10.There is nothing than going swimming in hot weather.

A. gooder B. good C. better D. best

11.Mary is responsible as Peter.

A. more B. the most C. much D. as

12.She is student in my class.

A. most hard-working B. more hard-working

C. the most hard-working D. as hard-working

13.He drives his brother.

A. more careful than B. more carefully

C. more carefully than D. as careful as

14.Tuan writes more with fewer mistakes than the previous term.

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

15.My father is happy because I get results at school.

A. bad B.good C. intelligent D. well

16.Peter does better at school because he works 

A. harder B. more carelessly C. more lazily D. worse

17.He can do sums more and read faster.

A. badly B. quickly C. difficultly D. fastly

18.Jane is not her brother.

A. more intelligent as B. intelligent as C. so intelligent as D. so intelligent that.

19.She is a very pupil. She spends most of her time studying.

a.hard-working B. difficult C. hard D. easy

20.My English this term is than that of last year.

A. good B. gooder C. better D. best

21.you study for these exams, you will do.

A. The harder / the better B. The more / the much

C. The hardest / the best D. The more hard / the more good,

22.My neighbor is driving me mad! It seems that it is at night, plays his music!

A. the less / the more loud B. the less / less

C. the more late / the more loudlier D. the later / the louder

23.Thanks to the progress of science and technology, our lives have become 

A. more and more good B. better and better

C. the more and more good D. gooder and gooder 

24.The Sears Tower is building in Chicago.

A. taller B. the more tall C. the tallest D. taller and taller

25.Peter is John.

A. younger and more intelligent than B. more young and intelligent than

C. more intelligent and younger than D. the more intelligent and younger than

26.San Diego is town in Southern California.

A. more nice and nice B. the nicer C. the nicest D. nicer and nicer

27.It gets when the winter is coming.

A. cold and cold B. the coldest and coldest

C. colder and colder D. more and more cold

28.The faster we finish, 

A. the sooner we can leave B. we can leave sooner and sooner

C. the sooner can we leave D. we can leave the sooner

29.Of all athletes, Alex is 

A. the less qualified B. the less and less qualified

C. the more and more qualified D. the least qualified

30.The faster Thanh walks, 

A. more tired B. the more tired he gets

C. he gets tired D. he gets more tired