Cho tam giác ABC vuông ở A, đương cao AH. Biết AB = 20cm, HC = 9cm. Tính độ dài AH.

$Cho ∆ABC vuông tại A. Kẻ đường cao AH, tính chu vi ∆ABC biết AH = 14cm, \frac{HB}{HC}=\frac{1}{4}$

Cho ∆ABC vuông tại A, AB = 12cm, AC = 16cm, phân giác AD, đường cao AH. Tính HD, HB, HC

$Cho ∆ABC vuông tại A. Biết \frac{AB}{AC} = \frac{5}{7}. Đường cao AH = 15cm. Tính HB, HC.$ 

Question 6: He was ___ when he was caught trying to catch a plane to France.
A. arrested B. put on probation C. executed D. acquitted
Question 7: Skilled_____ have produced perfect copies of many of the world’s famous paintings.
A. muggers B. smugglers C. rapists D. forgers
Question 8: The judge released him on ______ but he’ll have to appear in court again next week.
A. sentence B. bail C. punishment D. fine
Question 9: We made_____ the nearest port when we heard the storm warning.
A. out B. of C. up D. for
Question 10: The judge’s ruling_____ a wave of protest campaigns across the country.
A. instigated B. launched C. provoked D. commenced

Question 1: The puppy was_____ so much I nearly dropped him.
A. sniggering B. wriggling C. chuckling D. giggling
Question 2: We were_____ that the flight would be delayed for two hours.
A. invited B. ordered C. informed D. instructed
Question 3: He managed to _____  the branch of a tree and avoid being swept away by the flood waters.
A. clutch B. munch C. hug D. attach
Question 4: That man next to me on the bus must have been a _____ . My wallet has gone.
A. shoplifter B. kidnapper C. hijacker D. pickpocket
Question 5: The murder took place in the main street in the middle of the day, but there were no __ .
A. judges B. prosecutions C. witnesses D. juries

thực hiện phép tính chia rồi tìm GTNN của biểu thức

A=(9xy^2-6x^2y):(-3xy)+(6x^2y+2x^4):2x^2

Xét đẳng thức:    P: 3xy2 = 3x2y3 + 6x2 y2 + 3xy3 + 6xy2

Tìm cặp số nguyên (x, y) để P = 3

dùng hằng đẳng thức để thực hiện phép chia (1000 x^3+1):(10x+1)

dùng hằng đẳng thức để thực hiện phép chia (49x^2-81y^2):(7x+9y)

                              I.            Rewrite the sentences so that it stays the same meaing.

1.  Road users should obey traffic rules strictly.

Traffic rules ………………………………

2. He didn’t come because he was sick

He didn’t come because of …………………………..

3.  Althought she was ill, she went to school.

In spite of ……………………………………….

4.     I accepted the job although the salary was low.

In spite of ……………………………………….

5.  The light was not delayed though it was stormy.

Despite …………………………………………..

6. Although the prices are hight, my daughters insit on going to the movie.

Despite ……………………………………………………….

7. Although they study hard, they can’t get good marks.

In spite of ……………………………………………

8. Hoa has a lot of money, but she isn’t satisfied.

Althought ………………………………………….

Despite …………………………………………..

9. My uncle was a bus driver some year ago, but now he has a desk job.

-> My uncle used ____________________________________

10. My mum lived in a small village when she was a girl.

-> My mum used___________________________________

11. My parent lived in the USA when they were young.

-> My parents used…………………………………………..

12. There are more vehicles on the roads now.

-> There did not use __________________________________

13. We don’t cycle to school any more.

-> We used _______________________________________

14. Somebody will meet you at the bus station.

You …………………………………………………….