I have a robot. His name is David. I saw him when I went to the supermarket with my mom. He made me impressed. He has big armor, a small head with two horns. His eyes are like Superman's eyes. His right hand always holds a white sword. David is my best friend. I really love him.

`5-4kx=P(x)-4kx`

`->5=P(x)`

`-> P(x)=5`

2. Nam goes to school by bike everyday.

3. Does your family have 4 people ?

Câu lệnh lặp có dạng: for i:=1 to n do <câu lệnh>

→ Kết thúc khi được lặp lại lần thứ n.

`0,5x-2/3 .(x-2)=1/6`

`0,5x - 2/3 x + 4/3= 1/6`

` -1/6x = -7/6`

`x=7`

due

VT `= (cotx+cosx)/(1/(sinx)+1)`

Tử = `cotx+cosx`

`=(cosx)/(sinx) + cosx`

`= (cosx+cosxsinx)/(sinx)`

Mẫu = `1/(sinx) + 1 = (sinx+1)/(sinx)`

`=>` VT `=(cosx+cosxsinx)/(sinx) : (sinx+1)/(sinx)`

`= (cosx+cosxsinx)/(sinx+1)`

`=(cosx(sinx+1))/(sinx+1)`

`=cosx =` VP.

`=>` ĐPCM.

24. C

25. B

26. C

27. C

28. A

29. B

30 A

1. Rice is grown in tropical countries.

2. People's breathing is affected by the pollution in the city.

3. Mr. Ward has been awarded a prize for his essay.

4. That  letter wasn't written by Peter last night.

5. How is paper made ?

6. The newspapers are delivered once a day.

7. I wasn't invited to the birthday party.

8. These exercises must be finished before 4 o'clock.

9. We have been taught by Me. Smith for 2 years.

10. Their house will be sold next month.

6. was listening

7. hasn't met

8. to come

9. be solved

10. study