giai pt

\(\log_2\left(\sqrt{x^2-x+1}+\sqrt{x+1}\right)=\log_2\left(x+2\right)\)

Đặt hai quả cầu nhỏ có điện tích lần lượt là 3,0µC và -3,5µC tại hai điểm A và B cách nhau một khoảng 0,6m. Xác định vị trí điểm C sao cho vectơ cường độ điện trường tại đó có độ lớn bằng 0

Đặt hai quả cầu nhỏ có điện tích lần lượt là q₁ = 3,2.10\(^{-5}\)C và q2=-3,2.10\(^{-6}\)C trong chân không tại 2 điểm A, B cách nhau 0,9 cm. Xem hai quả cầu là các điện tích điểm. Xác định tỉ số độ lớn của hai vectơ cường độ điện trường do hai quả cầu gây ra tại điểm M. Biết điểm M cách A một khoảng 3cm và cách B một khoảng 6cm. Nhận xét phương, chiều của hai vectơ này1

chọn đúng sai

cho a,b là hai số thực dương tùy ý

a) \(\log_2a=\log_2b.\log_ba\)

b)\(\log_a\sqrt{a}=\log_{b^2}b\)

Xác định và phân tích tác dụng của biện pháp tu từ đối trong các đoạn thơ dưới đây

Một mình nương ngọn đèn khuya,

Áo dầm giọt lệ tóc se mái sầu:

" Phận dầu dầu vậy cũng dầu

Xót lòng đeo đẳng bấy lâu một lời!

Công trình kể biết mấy mươi,

Vì ta khăng khút cho người dở dang."

1.It's necessary for you to read books everyday. 

You........................

2.My father travelled around the country as soon as he retired
Only after ......................

3.My mother didn't watch the news until she finished her work.
It was ............
not until ........................

4.My aunt hasn't gone to this local market for two years.
It's ........................
my aunt last ..........................
the last ...............................

5."Don't forget to check the mistakes in the report carefully "The boss said.

the boss reminded ....................

6."I didn't remmember to pick up you at the airport, I'm sorry"she said to Nam.

She apologised ..........................

1."I won't come home late tonight" Nam said.

Nam promised .......

2."It was you that revealed this strategy to opponent" the man said to him

the man accused ..............

3. Were you at school yesterday, Hoa" she asked 

Hoa asked .............

4.Nam registered an advanced course. He won the scholarship after that.

Only after ................

5.Hoa is more hard-working than her classmates,

Hoa's classmates are ...................

6.The tickets of the final match were expensive, We didn't buy them.If ................................

7.It's likely that the manager will put off the plan due to lack of fund.

The manager ..................................

1.She's determined to make a ... of this project

A.success B.successful C.succeed D.successfully

2.She almost has no difficulty .....the questions in the interview

A.answering B.to answer C.answer D.answered

3.If you want to get the highest score in the exam, you should pull your .... up

A.hats B.socks C.hands D.eyes

4.Peter is talking to Linda and wants to have a drink with her at break time.

Peter: "Would you like to have a drink with me?"

linda: '' ............. let's go to the canteen!''

A. Oh, I'd love to but I'm afraid I can't.
B. Sorry I can't because I have a test then.
C. Oh, that's a good idea!
D. What a pity! What about tomorrow night?

5.Marie Curie was born .... Warsaw .... november 7th, 1867

A.in/on B.on/in C.on/on D.in/in

6.In spite of her difficult living conditions, she worked extremely .....

A.hardest B.harder C.hard D.hardly

7.Everyone is talking about the first movie star ....on the stage with her family.

A.appearing B.who appear C.to be appeared D.to appear

8.I ....romantic poem in my notebook when I read it this morning,

A.came into B.brought up C.ran across D.put down

9.she ... her sister, It's not easy to tell apart between them.

A.take over B.takes after C.takes on D.takes off

10.After I had completed all my homework, I decided to hit the .......

A.mouth B.pillow C.roof D.hay

11.the boy ... the old man for having an accident on the high way.

A.accused B.blamed C.insisted D.prevented

12.the hotel  ..... in the centre of a big city has attracted a lot of tourists.

A.building B.which building C.built D.to be built

1.Tuan as well as his classmates .....a conference in this university currently

A.are attending B.had attended C.is attending D.have attended

2.my mother .....me to go out with my classmates last Sunday.

A.avoided B.admitted C.suggested D.permitted

3.She is always determined to do anything she want's .she's a ... woman

A.strong-willed B.brilliant C.prevalent D.ambitious

4.please don't ask him questions about his family . He hates answering .... quenstions

A.personal B.private C.individual D.detailed

5.Using social media is a good way ...local heritage to the world.

A.introducing B.introduced C.to introduce D.introduce

6.Mr Paul, ....told that you were out, answer the phone.

A..whom B.which C.who D.that

7.If she had enough reference books, she ...to this bookstore.

A.shouldn't come B.wouldn't come B.won't come D.wouldn't have come

8.She has set her ... on being a teacher since she was a little girl. She managed to make it become true.

A.head B.heart C.brain D.hand

9.students .... the test on last week will have a chance to retake it next week

A.not taken B.not taking C.not to take D.who doesn't take

10.She refused ... some questions about the lawsuit
 A.answer B.to answer C.answer D.answered

11. Jane left her hometown for her dream in a foreign country in 1989 and ... since then

A.hasn't seen B.hasn't been seen C.didn't see D.doesn't see

12.The boss compliment his staff ... solving some difficulties in work.

A.with B.on C.about D.for

1.We are .... progress on improving our core business.

A.talking B.making C.paying D.doing

2.The monitor ..... us to prepare carefully for the graduation ceremony

A.suggested B.insisted C.advised D.congratulated

3. Tuan is a brilliant student. He always ...... the solutions to problems.

A.come up to B.put up with C.come up with D.look up to

4.my teacher always ....me to take part in the contests

A.encourages B.stops C.identifies D.considers

5.As a ..... accountant, she had plenty of experience of applying strict financial disciplines

A.enormous B.optimistic C.affordable D.qualified

6.The seriously injured in the accident ..... to hospital an hour ago

A.took B.have taken C.taken D.were taken

7.The house was very quiet when I .... home . everybody .... to bed

A.got/went B.get/have gone C.got/ had gone D.gets/goes

8.My son has passed the exam with flying colours .That's why he is over the .... now

A.cloud B.moon C.joy D.sky

9.jenny, ..... to make an impression on John, took him to the portrait gallery.

A.to want B.who want C.wanted D.wanting

10.My mother drives .....than her neighbours

A.as carefully B.much more carefully C.more careful D.most carefully

11.If the weather is fine this weekend, we.....to see our grandparents

A.were going B.would do C.will go D.went

12.Mr Nam is one of ..... neighbour I have ever known

A.more generous B.the most generous C.most generously D.the most generously