Hàm số y=f(x)=x⁴-8x³+432 có bao nhiêu điểm cực trị?

Cho hình vẽ, trong đó DE // BC, AE = 12, DB = 18, CA = 36. Độ dài AB bằng:

A. 30

B. 36

C. 25

D. 27

1 i was surprised at home easy he was to talk to.

_ I hadn't expected that he would be a person who is so easy to talk

2 it is almost nine months since i stopped subscribing to that magazine.

I cancelled my subscription to that magazine nine months ago.

3 She hasn't decied what career to follow yet (still)

She still hasn't decied what career to follow

4 How long is it since he quit school.(ago)

How long ago did she quit?

5 The guests did not start dancing until the newly weds had arrived.(before)

The guests waited until the newly weds arrived before they started dancing

6 the teacher meant to give us a quiz but she forgot it ( going)

The teacher was going to give us a quiz but she forgot it

x chia hết cho 13=>x=13k       (k thuộc N)

=>169<13k<260

=>13<k<20

=>k=14;15;16;17;18;19

=>x=182;195;208;221;234;247

Vậy x=182;195;208;221;234;247

My dream house is a large villa. It is near the coast, surrounded by rows of coconut trees and the blue sea. There are sixteen rooms in my house and half of them for relaxation and entertainment. It has a big garage so that I can store my super cars there. My house has wind power or solar energy. I use hi-tech and automatic machines such as a smart clock, modern fridge, automatic dishwasher and washing machine. They can be controlled by voice and help me tell the time, forecast weather, preserve food and wash dishes and clothes. There is a super smart TV in my house. I might surf the internet, watch my favourite TV programmes from space or contact friends on other planets by this fantastic TV. I might also join online classes on TV and not have to go to school.

Bài 355:
a: đáp án thứ nhất
b: đáp án thứ hai
1. a
2. a
3. b
4. b
5. a
6. b
7. b
8. b
9. b
10. a
11. b
12. b
13.b
14. b
15. b

I strongly support the use of personal electronic devices because of these reasons.

Firstly, they can provide a lot of information. Instead of using the traditional media like newspapers, we can use the Internet to surf webs to get information. Moreover, we can store information and text books which can save time and make students' backpacks lighter.

Secondly, they help students communicate with each other. When we are bored and tired of studying, we can relax by listening to music and playing games.

Last but not least, we can use learning apps on smartphones, laptops, tablets and other media player such as dictionaries, spelling, translation and so on to study better.

In conclusion, these devices can be great learning tools, but the wrong use may also cause very bad effects.

PART A: PHONETICS (2pts)

Section I: Choose the word which has the underlined part pronounced differently from the others.(1pt)

1. A. school B. chair C. chemistry D. character

2. A. serious B. symptom C. sugar D. sauce

3. A. order B. novel C. portable D. score

4. A. coop B. cartoon C. stool D. indoors

Section II. Choose the word that has different stress from others.(1pt)

1. A. complete B. detective C. gather D. event

2. A. mixture B. allow C. affect D. disease

3. A. exit B. cushion C. turtle D. improve

4. A. museum B. useful C. cavity D. wedding

PART B: VOCABULARY AND GRAMMAR.(10pts)

Section I: Choose the best answer from A,B,C or D to fill in the gaps.(2pts)

1. She is staying................................her uncle and aunt's house.

A. at B. in C. with D. on

2. Their trip to Da Lat ....................wonderful.

A. was B. were C. are D. is

3. There is............................meat in the box.

A. any B. a few C. a little D. many

4. Don't forget .....................your teeth before going to bed.

A. brush B. to brush C. brushing D. not to brush

5 You ............................stay at home when you are sick.

A. had better B. should C. mustn't D. A and B

6. He doesn't like candy. I.................

A. don't too B. don't, either C. don't neither D. do so

7. I divided the sweets.....................several boys.

A. during B. between C. into D. among

8. He was only ten, but he ate........................his father did.

A. as much as B. more that C. much than D. as much than

Section II: Supply the correct tense for the verbs in brackets.(2pts)

1. My mother often (go)..............to the market every morning but she ( not go)....................there this morning.

=> .........................................................................................................

2. When (you/ have).........................the last medical check-up?

=> .........................................................................................................

3. Why ( you/ not take) ..................part in the picnic last Sunday?

=> .........................................................................................................

4. Where ( your teacher/ be)....................?

- He (explain)......................a new lesson in that class.

=> .........................................................................................................

=> .........................................................................................................

5. I (pick)...............you up at your hotel in half an hour.

=> .........................................................................................................

6. We can't go out now because it (rain) .

=> ................................................................................................

Section III: Give the correct form of the words in brackets.(2pts)

1. The noise in the city kept Hoa...................at night. (Wake)

2. In................to that, my bike tires was flat. (Add)

3. Mr. Tan has a very...............................tooth. (Pain)

4. Then, Thanh.................a pan and stir-fried the beef. (Hot)

5. Sugar is not an......................food because we need it to live. (Health)

6. Catching the common cold is..................for every body. (Please)

7. Don't worry! Your cold will last for a few days and then................ (Appear)

8. I have.................time to play than my friend. (Little)

Section IV: Finish each of the following sentences in such a way that it is as similar as possible in meaning to the sentence printed before it.(2pts)

1 Listening to music is more interesting than watching TV.

=> I prefer........................................................................................................

2. It isn't important for you to finish the work today.

=> You don't......................................................................................................

3. How much is this dictionary?

=> What ........................................................................................................?

4. How heavy is the chicken?

=> What...........................................................................................................?

5. Mr. Trung and Mrs. Trung type quickly .

=> Mr. Trung and Mrs. Trung..................................................................................

6. I got to work in half an hour yesterday.

=> It took ..........................................................................................................

7. My mother doesn't like coffee and tea.

=> My mother likes neither....................................................................................

8. You shouldn't eat too much candy.

=> You'd...........................................................................................................

Section V: There is a mistake in each of these sentences. Underline the mistake and then correct it. (2pts)

1. The dirt on vegetables can cause you sick .

=> ..................................................................................................................

2. Scientists say that the life started in the ocean .

=> .................................................................................................................

3. He gave up to smoke 2 years ago.

=> ...................................................................................................................

4. He is a fast runner. He runs fastly.

=> ...................................................................................................................

5. Can I lend your pencil? I'm sorry. I'm using it.

=> ...................................................................................................................

6. You should keep silently when they are working.

=> ..................................................................................................................

7. How many times in a day do you brush your teeth ?

=> ...................................................................................................................

8. Long is worried because he has see the dentist.

=> ...................................................................................................................

PART C: READING.( 4pts)

Section I: Read the following story and write true (T) or false (F). (1.5pts)

When Dave was young, he played a lot of games, and he was thin and strong, but when he was forty-five, he began to get fat and slow. He was not able to breathe as well as before, and when he walked rather fast, his heart beat painfully.

He did not do anything about this for a long time, but finally he became anxious and went to see a doctor, and the doctor sent him to a hospital. Another young doctor examined him there and said, " I don't want to mislead you, Mr. Dave. You are very ill, and I believe that you are unlikely to live much longer. Would you like me to arrange for anybody to come and see you before you die?

Dave thought for a few seconds and then he answered, "I'd like another doctor to come and see me".

Your answers:

1. Dave was fat and slow until he was forty five.

2. As soon as Dave had trouble in breathing and walking, he went to see a doctor.

3. Dave was afraid he was ill.

4. The young doctor thought Dave was going to die soon.

5. He wanted to see another doctor, first.

6. Dave did not trust the young doctor.

Section II: Read the passage and write ONE suitable word for each space. (2.5pts)

Many people nowadays have to wear false teeth when they was middle-aged.

Since the beginning of this century,(1)..................decay has greatly increased. The amount(2) ..................sugar in our food has also increased Doctors and dentists now know that(3)..........................is the chief cause of tooth(4) ................ Eskimos' teeth, for example, started to(5)..........when they began to eat sweet(6)..................

Long ago doctors did not like(7).........treat people's teeth. Barbers and blacksmiths(8)................after people's teeth and pulled them(9)............ when they decayed. Some people thought(10)..................................was a punishment from the gods.

PART D: READING.( 4pts)

Section I: Using the givens words to write a passage. (2pts)

Dung/ go/ Nha Trang/ family/ vacation/ last month//. She/ stay/ hotel/ side/ beach//. In the early morning/ she/ go/ sea/ swim/an hour//. Then/ she/ breakfast/ food stall/ beach/ enjoy/ fresh air/ morning//. Afternoon/ she/ take/ photos/ sights//. She/ stay/ Nha Trang/ four days/ took/ nice photos//. She/ also/ buy/ postcards/ souvenirs/ friends//. It/ be/ great vacation/ because/ she/ have/fun.

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

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

Section II: Write a passage about 150 words to describe the activities at recess (2pts)

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

số bị chia là 155 
số dư là 12 
vậy 155-12=143 phải là số chia hết cho số chia 
143 là số nguyên tố nên chỉ chia hết cho 143 và 1 
mà số chia ko thể là 1 vì 1<12 
nên số chia là 143 và thương là 1