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7 tháng 11 2021

\(\left|2021x+2022\right|+\left|2021x-2021\right|=\left|2021x+2022\right|+\left|2021-2021x\right|\ge\left|2021x+2022+2021-2021x\right|=\left|4043\right|=4043\)

Dấu "=" xảy ra \(\Leftrightarrow\left(2021x+2022\right)\left(2021-2021x\right)\ge0\)

\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x\ge-\dfrac{2022}{2021}\\x\le1\end{matrix}\right.\\\left\{{}\begin{matrix}x\le-\dfrac{2022}{2021}\\x\ge1\end{matrix}\right.\end{matrix}\right.\)\(\Leftrightarrow-\dfrac{2022}{2021}\le x\le1\)

7 tháng 11 2021

cảm ơn bạn nhiều ạ

 

AH
Akai Haruma
Giáo viên
13 tháng 11 2023

Bạn gõ hẳn đề ra thì khả năng mọi người sẽ giúp bạn sẽ cao hơn nhé. Đọc như thế này hơi khó.

18 tháng 12 2021

like playing soccer, don't you
goes to school late, doesn't he
can swim very well, can't you
is going to the party, isn't she
was published in Germany in 1550, wasn't it
are sold all over the world, aren't they
have been built this year, haven't they
was given a book, wasn't he 
were bought by Mrs Brown yesterday, weren't they
is used everyday, isn't it

ai có thể giúp mình làm bài này với đc không ạ (xin cảm ơn)I.Hãy viết hình thức so sánh hơn và nhất của các tính từ sau:ADJ/advHơnNhấtADJ/advHơnNhất1- cheapcheaperThe cheapest7- friendly................................................2- far...........................................8- badly/bad................................................3- big..........................................9- many/much................................................4-...
Đọc tiếp

ai có thể giúp mình làm bài này với đc không ạ (xin cảm ơn)

I.Hãy viết hình thức so sánh hơn và nhất của các tính từ sau:

ADJ/adv

Hơn

Nhất

ADJ/adv

Hơn

Nhất

1- cheap

cheaper

The cheapest

7- friendly

........................

........................

2- far

.....................

......................

8- badly/bad

........................

........................

3- big

......................

....................

9- many/much

........................

........................

4- fluent

......................

.....................

10- dangerous

........................

........................

5- good/well

......................

.....................

11- hard

........................

........................

6- busy

.....................

.....................

12- quiet

........................

........................

1. So sánh ngang bằng.

a. This book/ not/ interesting/ I expected

_______________________________________________

b. Jack/ swim/ good/ Tom

_______________________________________________

c. we/work/twice/slow/ they.

_______________________________________________

d. A car/ not/run/ fast/ a train

_______________________________________________

e. My father/ carve /skilful/ my grandfather

_______________________________________________

2. So sánh hơn: (Nhấn mạnh các câu ss hơn)

a. My room/ comfortable/ yours

_______________________________________________

b. A plane/can fly/ quick/ a bird

_______________________________________________

c. Peter/ eat/ much/ I.

_______________________________________________

d .Your house/far/from school /my house. _______________________________________________

e. My father / cook/ good/ I

_______________________________________________

3. So sánh nhất: ( Nhấn mạnh theo 2 cách đã học)

a. Everest/ high/ mountion/ in the world

_______________________________________________

b. Mai/ talk/ slow / in my class.

_______________________________________________

c. English coffee/bad/ of all.

_______________________________________________

d. Anna/ behave/polite/ in the world.

_______________________________________________

e. They / play the guitar/ good/ of all

._______________________________________________

f. My grandmother/old/ in my village=>

_______________________________________________

II. Complete the sentences using the correct form of the adjectives or adverbs in brackets

(chia về các dạng so sánh đúng)

III. Cirle the best option to complete each sentence:

1. The flower was.......... out of a single piece of valuable wood. 

A. carved              B. moulded       

C cast                   D. given

2. In this town, they_____ all the frames in steel.

A. make               B. have                     C. mould                    D. cast

3. She is skilled at ____ cloth.

A. giving               B. weaving                C doing                      D. carving 

4. If you like, I can_____ flowers on the cushion covers for you.

A. grow                B. make                    C. embroider               D. knit

5. Is it true that you.......... this woollen hat yourself?

A. knitted             B. wove                    C did                          D. carved

6. The doll has been.......... out of clay.

A. embroidered      B. cast                    C. woven                  D. moulded

7. I love going to this place _____ it's the quietest place in the city.

A. so                     B. though                  C. so that              D. as 

8. They keep changing the decoration of the shop_______ they can attract more young people.

A. so that              B. because                C. although           D when

9.________ he's young, she's the most famous artisan in the village.

A. When                B. Although                C. Whereas           D. In order to

10. Do you know who's______ his pottery workshop?

A. bring out           B. taking over            C. passing down    D. turning down

11. I've_______ the product catalogue and decided to buy this table.

A. found out          B. closed down            C. looked through   D. lived on

12. This sports centre is so small that it cannot______the demands of local residents.

A. keep up with        B. face up to            C. deal about            D. setup

13. When I turned up, the town hall was already_____ of teenagers.

A. full                   B. packed     C. crowded           D. jammed

14. She turned ______the new job in New York because she didn't want to move.

A. on                   B. down  C. off                   D. up

15. This city has one of the most___ underground rail networks in the world.

A. efficient                           B. fashionable   C . cosmopolitan                   D. fascinated

4. This laptop is much more user-friendly, but it costs________ the other one.

A. so much as                  B. as many as     C. twice as much as         D. twice as many

5. Today's cities are____than cities in previous times.

A. lots larger                  B. much larger    C. as large                     D. the largest

6. After I found all the information I needed, I________the computer.

 A. turned off                 B. switched on    C. looked for                  D. put off

7. Japan is the__________ developed country in the world.

A. most second             B. second in most        C. second most             D. two most

8. Factories and offices should be built in __________areas only.

A. rural                        B. Coastal      C. culture                     D. urban

0
17 tháng 2 2022

unpollute

deforestation

environmental

pollution

conservationists

prevention

extremely

environmentalist

protection

seriously

poisonous

23 tháng 12 2021

bạn bấm vào đáp án và giữ kéo ra ô thích hợp bạn nhé

2:

a: =(1+căn 3)^2-5

=4+2căn 3-5

=2căn 3-1

b: \(=\sqrt{\dfrac{125}{7}\cdot\dfrac{35}{81}}=\sqrt{\dfrac{625}{81}}=\dfrac{25}{9}\)

c: \(=\left(\sqrt{3}-1\right)\left(\sqrt{3}+1\right)-\sqrt{6}+\sqrt{2}\)

=2-căn 6+căn 2

3:

a: \(=\dfrac{2\sqrt{3}+3\sqrt{3}-\sqrt{3}}{\sqrt{3}}=2+3-1=5\)

b: \(=\dfrac{6\sqrt{2}+7\sqrt{2}-5\sqrt{2}}{\sqrt{2}}=13-5=8\)

c: \(=\dfrac{12-10+8}{2}=5\)

d: \(=\sqrt{\dfrac{1}{5}:5}-\sqrt{\dfrac{9}{5}:5}+\sqrt{5:5}\)

=1/5-3/5+1

=3/5