tìm giá trị nhỏ nhất của bt /x-3/+/4+x/
K
Khách
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14 tháng 3 2020
Trả lời:
Biện pháp nghệ thuật: Miêu tả về khung cảnh, có từ láy gợi hình, đảo ngữ.
Tác dụng: Miêu tả về khung cảnh làm cho bài thơ không thấy trống vắng, thiếu người ở một nơi hẻo lánh
Từ láy gợi hình làm cho khung cảnh cùng với con người trở nên sinh động, gợi lên tình cảm thiên nhiên cùng con người trong bài
Đảo ngữ là phép đối của tác giả là bà Huyện Thanh Quan, đảo vị ngữ lên đầu và chủ ngữ xuống sau
#Học tốt:))
T
14 tháng 3 2020
. Biện pháp nghệ thuật: Miêu tả về khung cảnh, có từ láy gợi hình, đảo ngữ.
Tác dụng: Miêu tả về khung cảnh làm cho bài thơ không thấy trống vắng, thiếu người ở một nơi hẻo lánh
Từ láy gợi hình làm cho khung cảnh cùng với con người trở nên sinh động, gợi lên tình cảm thiên nhiên cùng con người trong bài
Đảo ngữ là phép đối của tác giả là bà Huyện Thanh Quan, đảo vị ngữ lên đầu và chủ ngữ xuống sau
Nhớ k Đúng cho mk nha
14 tháng 3 2020
Giá trị lớn nhất nhá
\(a,-\left(x-3\right)^2+2\)
Ta thấy \(\left(x-3\right)^2\ge0\Rightarrow-\left(x-3\right)^2\le0\forall x\)
\(\Rightarrow-\left(x-3\right)^2+2\le2\)
Dấu "=" xảy ra khi \(x-3=0\Leftrightarrow x=3\)
...
\(b,-\left|2x-1\right|-5\)
Ta thấy \(\left|2x-1\right|\ge0\Rightarrow-\left|2x-1\right|\le0\forall x\)
\(\Rightarrow-\left|2x-1\right|-5\le-5\)
Dấu "=" xảy ra khi \(2x-1=0\Leftrightarrow x=\frac{1}{2}\)
....
c, \(\sqrt{3}-x^2\)
Ta thấy \(x^2\ge0\Rightarrow-x^2\le0\forall x\)
\(\Rightarrow\sqrt{3}-x^2\le\sqrt{3}\)
Dấu "=" xảy ra khi \(x=0\)
...
18 tháng 3 2020
I. Choose one word whose underlined part is pronounced differently from the others.
1. A. apricot B. lantern C. gather D. cranberry
2. A. studied B. learned C. stopped D. watered
3. A. celebrate B. candle C. cake D. racing
4. A. attended B. happened C. succeed D. reheared
5. A. prefer B. desert C. held D. festival
II. Choose the word whose main stress is placed differently from the others.
1. A. award B. drama C. actor D. hero
2. A. appear B. prepare C. allow D. happen
3. A. diverse B. serious C. special D. local
4. A. order B. receive C. perform D. replace
5. A. combine B. invite C. circle D. discuss
III. Choose A, B, C or D for each gap in the following sentences.
1. He forgot to give ------------- before he turned left and got a ket..
A. signal B. sign C. light D. hand
2. Cyclists and motorists have to wear a --------- when they ride a motorbike.
A. hard hat B. cap C. mask D. helmet
3. We ------------- outside.
A. usedn’t to play B. usedn’t to played C. didn’t used to play D. didn’t use to play
4. She --------- time in the supermarket.
A. use to spend B. used to spend C. use to spending D. used to spending
5. --------------- I didn’t the film, everybody else seemed to enjoy it.
A. Although B. Despite C. Nevertheless D. However
6. Minh said his English is terrible. -------------, he got a perfect score on his English test.
A. Although B. despite C. Nevertheless D. However
7. The doctor said that he needs tostop eating meat. -------------, he still eats a hamburger every day for lunch.
A. Although B. despite C. Nevertheless D. However
8. My brother went to work the next day --------- he was still feeling ill.
A. although B. despite C. nevertheless D. However
9. I’d to talk to you ------------- I know you are busy.
A. although B. despite C. nevertheless D. however
10. We’re studying now---------there’s an interesting film on TV.
A. although B. despite C. nevertheless D. however
11. ‘Hi, you look tired.’ ‘___________’
A. I am. I’m totally exhausted. B. Yes, I’m very excited. C. You too. D. No, thanks.
12. My nephew was --------- by the clown.
A. amuse B. amusing C. amused D. to amuse
13. A ------------- is a film that tries to make audiences laugh.
A. horror B. sci-fi C. comedy D. documentary
14. We found the plot of the film --------- .
A. bored B. boring C. interested D. acting
15. We were ------------- with the latest film of thaty director.
A. satisfy B. satisfying C. satisfactory D. satisfied
16. A lot of cultural and --------- activities are held as part of the Flower Festival in DaLat.(art)
A. arts B. artist C. artis D. art
17. It is ------------- to see elephants racing in the Elephant Race Festival in Dak Lak.
A. amaze B. amazing C. amazed D. amazement
18. The biggest prize of the Cannes Film Festival is the Palme d’d Or, which is given ---------the best film.
A. of B. to C. with D. for
19. The Saba Parade in Rio Carnival has thousands of samba -------------from various samba schools.
A. perform B. performance C. performer D. performers
20. The Academy Awards, commonly --------- as The Oscars, are the most famous film awards in the world.
A. know B. knew C. known D. be known
21. All cris said that film was really --------; nevertheless, I was so………. that I saw it from beginning to end.
A. interesting - boring B. boring - interesting
C. interested - bored D. boring - interested
22. --------- having a happy ending, the film starts with a terrible accident.
A. Despite B. Although C. However D. Nevertheless
23. In spite of the silly-------------, many people enjoyed that comedy.
A. actor B. scene C. character D. plot
24. Although the acting is wonderful, the ending is very--------- .
A. exciting B. fantas C. interesting D. boring
25. They spend a huge amount of money on the film;……...., it was not a big success.
A. although B. however C. but D. because
26. --------- he is a famous actor, he has failed in his recent films.
A. Although B. Despite C. However D. Because
27. Who is going to------------- the Oscar for Best Actor this year?
A. get B. take C. win D. pass
28. The film Titanic was the most successful - it --------- $1,750 million and ……… eleven Oscars.
A. did - got B. made - won C. won - made D. got - did
29. Charlie Chaplin was the most famous ------------- of the silent films.
A. star B. acting C. plot D. scene
30. Cameron Diaz and Julia Robert are the best-paid actresses-both --------- $20 million for their last films.
A. took B. did C. paid D. earn
14 tháng 3 2020
I. Choose one word whose underlined part is pronounced differently from the others.
1. A. apricot B. lantern C. gather D. cranberry
2. A. studied B. learned C. stopped D. watered
3. A. celebrate B. candle C. cake D. racing
4. A. attended B. happened C. succeed D. reheared
5. A. prefer B. desert C. held D. festival
II. Choose the word whose main stress is placed differently from the others.
1. A. award B. drama C. actor D. hero
2. A. appear B. prepare C. allow D. happen
3. A. diverse B. serious C. special D. local
4. A. order B. receive C. perform D. replace
5. A. combine B. invite C. circle D. discuss
III. Choose A, B, C or D for each gap in the following sentences.
1. He forgot to give ------------- before he turned left and got a ket..
A. signal B. sign C. light D. hand
2. Cyclists and motorists have to wear a --------- when they ride a motorbike.
A. hard hat B. cap C. mask D. helmet
3. We ------------- outside.
A. usedn’t to play B. usedn’t to played C. didn’t used to play D. didn’t use to play
4. She --------- time in the supermarket.
A. use to spend B. used to spend C. use to spending D. used to spending
5. --------------- I didn’t the film, everybody else seemed to enjoy it.
A. Although B. Despite C. Nevertheless D. However
6. Minh said his English is terrible. -------------, he got a perfect score on his English test.
A. Although B. despite C. Nevertheless D. However
7. The doctor said that he needs tostop eating meat. -------------, he still eats a hamburger every day for lunch.
A. Although B. despite C. Nevertheless D. However
8. My brother went to work the next day --------- he was still feeling ill.
A. although B. despite C. nevertheless D. However
9. I’d to talk to you ------------- I know you are busy.
A. although B. despite C. nevertheless D. however
10. We’re studying now---------there’s an interesting film on TV.
A. although B. despite C. nevertheless D. however
11. ‘Hi, you look tired.’ ‘___________’
A. I am. I’m totally exhausted. B. Yes, I’m very excited. C. You too. D. No, thanks.
12. My nephew was --------- by the clown.
A. amuse B. amusing C. amused D. to amuse
13. A ------------- is a film that tries to make audiences laugh.
A. horror B. sci-fi C. comedy D. documentary
14. We found the plot of the film --------- .
A. bored B. boring C. interested D. acting
15. We were ------------- with the latest film of thaty director.
A. satisfy B. satisfying C. satisfactory D. satisfied
16. A lot of cultural and --------- activities are held as part of the Flower Festival in DaLat.(art)
A. arts B. artist C. artis D. art
17. It is ------------- to see elephants racing in the Elephant Race Festival in Dak Lak.
A. amaze B. amazing C. amazed D. amazement
18. The biggest prize of the Cannes Film Festival is the Palme d’d Or, which is given ---------the best film.
A. of B. to C. with D. for
19. The Saba Parade in Rio Carnival has thousands of samba -------------from various samba schools.
A. perform B. performance C. performer D. performers
20. The Academy Awards, commonly --------- as The Oscars, are the most famous film awards in the world.
A. know B. knew C. known D. be known
21. All cris said that film was really --------; nevertheless, I was so………. that I saw it from beginning to end.
A. interesting - boring B. boring - interesting
C. interested - bored D. boring - interested
22. --------- having a happy ending, the film starts with a terrible accident.
A. Despite B. Although C. However D. Nevertheless
23. In spite of the silly-------------, many people enjoyed that comedy.
A. actor B. scene C. character D. plot
24. Although the acting is wonderful, the ending is very--------- .
A. exciting B. fantas C. interesting D. boring
25. They spend a huge amount of money on the film;……...., it was not a big success.
A. although B. however C. but D. because
26. --------- he is a famous actor, he has failed in his recent films.
A. Although B. Despite C. However D. Because
27. Who is going to------------- the Oscar for Best Actor this year?
A. get B. take C. win D. pass
28. The film Titanic was the most successful - it --------- $1,750 million and ……… eleven Oscars.
A. did - got B. made - won C. won - made D. got - did
29. Charlie Chaplin was the most famous ------------- of the silent films.
A. star B. acting C. plot D. scene
30. Cameron Diaz and Julia Robert are the best-paid actresses-both --------- $20 million for their last films.
A. took B. did C. paid D. earn
14 tháng 3 2020
Bạn vô mục câu hỏi tương tự sẽ có lời giải nha ^_^
PD
2
don gian
Ta có : Ix-3I+I4+xI
biết : Ix-3I \(\ge\)0
I4+xI \(\ge0\)
=) 2 TH :
TH 1 : I4+xI = 0 với x = -4 =) Ix-3I = 7
=) 4+x = 0
=) x = 0 - 4 = -4
=) A = 7
TH 2 : Ix-3I = 0 với x = 3 thì =) I4+xI = 7
=) x = 0 + 3 = 3
Xét : TH 1 = TH 2
=) để A có giá trị nhỏ nhất thì \(x\in\left\{-4;3\right\}\)
đăng kí kênh của V-I-S nha !