Bài 3: 

1: Ta có: \(P=\dfrac{\sqrt{x}+1}{\sqrt{x}-2}+\dfrac{2\sqrt{x}}{\sqrt{x}+2}-\dfrac{5\sqrt{x}+2}{x-4}\)

\(=\dfrac{x+3\sqrt{x}+2+2x-4\sqrt{x}-5\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)

\(=\dfrac{\sqrt{x}}{\sqrt{x}+2}\)

đoạn trích nào nhỉ

đoạn trích nào vậy bạn

a: =>x+2013=0

hay x=-2013

b: =>50-x=0

hay x=50

II. Rewrite these sentences

1.      This street is narrower than that one

Þ    That street …isn't as narrow as this one…………………………………………..

Þ    That street …is bigger than this one………………………………………………

2. Linda drives more carefully than Peter

Þ    Peter……doesn't drive as carefully as Linda………………………………………

Þ    Peter…drives more carelessly than Linda………………………………………………..

3.Your car is more convenient than mine

Þ    My car ……isn't as convenient as.yours………………………………………………..

Þ    My car……is incovenient than yours………………………………………………..

4. We behave more politely than her

Þ    She………behaves less politely than us……………………………………………….

Þ    She ………doesn't behave as politely as us………………………………………………

5.I  cook better than my mother

Þ    my mother………doesn't cook as well as me……………………………………………………..

Þ    my mother ………cook more badly than me………………………………………………………

6. Anna isn’t as confident as me

=> I …am more confident than Anna………………………………….

7. This book isn’t as boring as that one

Þ    That book ….....is more boring than this one...................................................

8. I don’t work as effectively as he does

=> He ………work more effectively than me………………………………….

9. My bedroom isn’t so comfortable as yours

Þ    Your bedroom……is more comfortable than mine………………………..

10. John didn’t speak English as well as Mary

=> Mary ………spoke English better than John………………………………….

11. Peter can dance the most gracefully in my city

=> No one……can dance as gracefully as Peter in my city

…………………………………………….

=> No one………can dance more gracefully than ………………………………………

12. Kangaroo is the most unique animal in the world

=> No………animal in the world is more unique than Kangaroo……………………………………………..

=> No…………animal in the world is as unique as kangaroo…………………………………………….

13. No river in the world is longer than Nile

=> Nile ……is the longest river in the world……………………………………………

14. No student in my class learns Maths more intelligently than John

=> John………learns Math the most intelligently in my class ……………………………………………………………

15. If you read many books, you will have much knowledge

→ The more …books you read, the more knowledge you have………………………………………………………………….

16. He speaks too much and people feel bored.

→ The more …he speaks, the more bored people feel………………………………………………………………….

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

16. 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

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

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

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

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

19. Japan is the__________ developed country in the world.

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

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

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

21. My grandfather is _____ the oldest person in my village

A. by far                       B. a lot                    C. second                               D. much

22. The last runner tried ____ better than the first one

A. by far                           B. third                 C. a bit                  C, more

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