BÀi 1: cho hàm số y= ax^2+bx-3

a, tìm a,b biết parabol đi qua điểm A(-1;0) và và có trục đối xứng x=1

b, lập bảng biến thiên và vẽ đồ thị hàm số trên khi a=1; b=2

I: Choose the word whose underlined part differs from the other.

Question 1: A. soften

Question 2: A. now

Question 3: A. this

Question 4: A. when

II. Choose the word that differs from the rest in the position of the main stress,

Question 5: A. habit

Question 6: A. student

III. Choose the correct answer to each of the following questions

Question 7: Don't you think my jeans need . B. fifteen B. how B. mine B. settle C. enter C. know C. file C. become D. party D. down D. night B. become B. member C. learner C. prefer D. mother D. teacher ee C learne Stress D ig 2 A. clean A. see A. tell A. take B. to clean B. to see B. to tell B. to take B. to answer C. cleaning C. seeing C.telling C. taking D. cleans D. will see D. tells D. took

Question 8: They will never forget.the Prince.

uestion 9: His teacher regrets...............im that his application for the job has been turned down.

Question 10: The workers stopped.a rest because they felt tired.

Question 11: That girl tried to avoid...some of my questions C. answering D. answered A answe

Cho a,b,c là các số dương. Chứng minh rằng:

\(\dfrac{a+b}{c}\) + \(\dfrac{b+c}{a}\) +\(\dfrac{c+a}{b}\)≥4(\(\dfrac{a}{b+c}\)+\(\dfrac{b}{c+a}\)+\(\dfrac{c}{a+b}\))

Câu 1:

a, Cho A=9-3\(\sqrt{7}\) và B=9-3\(\sqrt{7}\). Hãy so sánh A+B và A*B

b, Tính giá trị của biểu thức M=(\(\dfrac{1}{1+\sqrt{x}}\)-\(\dfrac{1}{3+\sqrt{5}}\)) : \(\dfrac{5-\sqrt{5}}{\sqrt{5}-1}\)

c, Chứng minh rằng Với x>= 0 thì P=(\(\dfrac{1}{1-\sqrt{x}}\)-\(\dfrac{1}{1+\sqrt{x}}\) ):(1-\(\dfrac{1}{\sqrt{x}}\)) luôn nhận giá trị âm

Bài 1: A= x²-x+1

A= x²-x+1

A= x²-2*1/2*x+1/4-1/4+1

A= (x-1/2)²+3/4

vì (x-1/2)²>=0 với mọi x

=> (x-1/2)²+3/4>=3/4 với mọi x

dấu bằng xảy ra <=> x-1/2=0

<=> x =1/2

vậy min A= 3/4 <=> x=1/2

Bài 1: Cho tam giác ABC vuông tại A. Đường cao AH. C/M

a, tam giác ABH đồng dạng với tam giác AHC

b, kẻ đường phân giác AD là tia phân giác của góc HAC, Bk là tia phân giác của góc ABC. BK cắt AH và AD lần lượt là E và F.

CM tam giác AFE đồng dạng với tam giác BEH

c, KD// AH

d, EH/AB=Kd/AD

cảm nhận của e về đoạn trích chiếc lược ngà

I Choose the word whose underlined part is pronounced differently from the others.

existed C. occurred heavy A. health D. describe mineral A. tidal B throw D. thought A. though D. pull C. trust thunder

II Choose the best answer from the four options given (marked A, B,C, or D) to complete each sentence.

6. can't understand the French visitors. I wish ......................... French.

A. knew B. will know C. know D. have known

7. The church ............... about 100 years ago

A. is built B. was built C. will be built D. has been built

8. People in Israel are going to celebrate their festival ..................... is called Passover.

A. whose B. who C. which D. where

9. ...................... I was really tired, I couldn't sleep.

A. Even though B. so C. Therefore D. Because of

10. Lan is very tired. ................. , she has to finish her assignment before going to bed.

A. Although B. so C. Therefore D. However

11.I suggest ............. some money for poor children.

A. raise B. to raise C. raised D. raising

12. She asked me if I .................. a laptop computer the following day.

A buy B. will buy C. bought D. would buy

13. I ........................ telephone her ifI knew her number.

A. would B. have to C. will D. shall

14, Honda motorbikes ........................ in Viet Nam.

A. produce B. will produce C. are produced D. would be produced

15. We have learnt English ...................... 2001

A. for B. Since C. in D. during

III, Complete the second sentence so that it has a similar meaning to the first one.

1. They have just sold that old house.

That old house ............................................

2, The weather was bad but they had a wonderful holiday.

Although ...................................................................

3. They will build a new mall here

A new mall ........................................

4. Unless he takes these pills, he won't be better

If .........................................................................

5. Depite working hard, he can't support his large family.

Although .........................................................................

IV. Give correct form of the words

1. There are always because the firm is so......................... (efficient)

2. Vietnam is determined to .........................successfully in the country. (society)

V- Read the passage carefully and then answer the question below.

Every child in Great Britain between the age of and fifteen must attend school. There are three main types of institutions: primary (elementary) schools, secondary schools and universities. State schools are free, and attendance i Morning school begins at nine o'clock and lasts until half past four. School is open a week. On Saturdays and Sundays there are no There are Christmas. Easter and in summer. In London as in all cities there at schools are two those who will go to work at fifteen: primary schools for between the ages of five and eleven, and girls years. and secondary schools for children from eleven to fifteen The lessons are reading, writing the English language, English literature, English history, geography, science. Nature study, drawing, painting, singing, woodwork and drill (physical training)

1. What are three main types of educational institutions?

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

2. What are the two grades of state schools for those who will go to work fifteen?

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

3. What subjects do children study at school?

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

4. Are state schools free?

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

I. Choose the word whose underlined part is pronounced differently from the others.

1. A. baggy B. casual C. label D. fashion

2. A. city B. recycle C. center D. collect

3. A. tea B. listen C. sent D. tend

4. A. books B. cats C. maps D. dogs

II. Supply the correct word forms to complete the following sentences.

1. Getting to the village is a very ......................... Journey. (INTEREST)

2. My father is a careful driver. He drives ............................ . (CARE)

3. This ............................ has written many stories for children. (WRITE)

4. The newspaper is published ...................... You can get it everyday. (DAY)

III. Ch oose the best answers.

l. He used to collect stamps. He gave up ..................... stamps 5 years ago.

A. to collect B. collected C. collecting D. to have collected

2. I would have seen Ann if I ................... to the party last night.

A. went B. would go C. had gone D. have gone

3. Are these books used ........................... English in your country?

A. teach B. to teach C. teaching D. to teaching

4. Town ........................ used to go through city streets, shouting about the things they wanted to sell.

A. shouters B. criers C. singers D. dancers

5. Messages that a person receives or send on the computer are ......................... .

A. data B. information C. e-mails D. texts

6. Hoa Hoc Tro is one of the most ....................... magazines for teenagers.

A. like B. dislike C. know D. popular

7. Living in a far-away one of the most .................. to the Net easily.

A. access B. work C. connect D. relation

IV. Rewrite each of the following sentences in another way.

1. He used to study the best in this class.

->No one ....................................................

2. "I'm worried about my father's sickness", Alice said.

->Alice said .....................................................................

3. Why don't you use energy-saving bulbs, Lan?

->If I ....................................................................................

4. She last saw her friend five years ago.

->Her friend has ...............................................................

5. You'd better not lend that man any more money, Mary" said John .

->John advised ...............................................................................

VI. Read the passage and choose the best answer from A, B, C, or D.

Parents send their children to school to prepare for the time when they grow up Children learn their native language so that they will be able to communicate fluently with other people around them. Moreover, they can preserve the valuable culture and literature of their country. They learn foreign languages in order to benefit from other countries' heritage. The more foreign languages they learn, the more benefits they also learn math to calculate, geography to know about nature, and history to know about human beings and historical events. Nearly everything they s at school has some practical uses in their life.

1. Parents send their children to school to ............ .

A. play better B. learn English C. prepare for their future D. make them grow up

2. Why do children have to learn their native language?

A. To learn foreign languages. B. To communicate fluently with other people around them.

C. To benefit from foreign countries' heritage. D. To know about nature.

3. According to the passage, children learn history to know about .......................... .

A. people and historical events B. practical uses in life

D. the mankind C. events of the history

4. How many school subjects are mentioned in the passage?

A. Five. B. Seven C. Six.D. Four.

5. Most of the things children learn at school .

A. are useless B. have no use C. are not necessary D. have some practical uses