1 / 

B = 15 + 17 - 16

B = 16

mà 16 không chia hết cho 12 , nên không cần chứng minh cũng ra

2 / 

 a ) N = 1 đó

 b ) N = 1 đó

cách dễ nhất là cứ cho N = 1 , vì bao nhiêu lần 1 thực hiện phép tính chia thì chắng chia hết cho 1

còn lại tương tự nhé !

mình còn làm violympic nữa

20150 đúng đó bạn

5/ Cho natri cháy trong không khí thu được 9, 3 gam một hợp chất A.

a/ Hãy phân loại và gọi tên A?

b/ Tính khối lượng natri ?

c/ Tính thể tích không khí cần dùng, biết oxi chiếm 20% thể tích không khí. 2

d/ Cần nhiệt phân bao nhiêu gam KMnO4 để thu được lượng khí oxi trên?

6/ Cho phương trình: KClO3 → ?+ ?

a/ Nếu thoát ra 2, 688 lít khí (đktc) thì khối lượng KClO3 cần dùng là bao nhiêu?

b/ Dùng khí oxi trên đốt cháy nhôm tạo thành hợp chất B.

+ Hãy phân loại và gọi tên B?

+ Tính khối lượng nhôm và khối lượng B?

7/ Đốt cháy 6, 2g photpho trong không khí thu được một hợp chất X.

a/ Hãy phân loại và gọi tên X?

b/ Tính khối lượng X ?

c/ Tính thể tích không khí cần dùng, biết oxi chiếm 1/5 thể tích không khí.

d/ Cần nhiệt phân bao nhiêu gam KClO3 để thu được lượng khí oxi trên?

Các bạn giúp mình với mình cảm ơn nhiều ạ

* = 0;2;4;6;8

IV. REWRITE

1. Please don’t smoke in this room. 

Would you mind ................................................................................................................

2. Could I turn the air conditioner on? 

Would you mind ................................................................................................................

3. Could I have his telephone number? 

Do you mind .....................................................................................................................

4. Can I participate in Y & Y organization? 

Do you mind.......................................................................................................................

5. Will you permit me to go to BTS’s concert tonight? 

Would you mind .................................................................................................................

6. A thief stole my car last night. 

My car ..............................................................................................................................

7. His friends draw these pictures. 

These pictures....................................................................................................................

8. Nha Tran didn’t win the prize last summer. 

The prize............................................................................................................................

9. They make shoes in that factory. 

Shoes ................................................................................................................................

10. They also speak German at EU meetings. 

German ..............................................................................................................................

11. The boy is a millionaire. He is sitting opposite us is a millionaire. 

The boy .............................................................................................................................

12. The man is my uncle. He is standing at the door is my uncle. 

The man.............................................................................................................................

13.The house belongs to Ms Jane. It was built last week. 

The house...........................................................................................................................

14. The street is very wide. It leads to the school is very wide. 

The street .........................................................................................................................

15. The system is very successful. It was used here. 

The system ........................................................................................................................

16. This machine is easy to use. 

It is ...................................................................................................................................

17. Some words are impossible to translate. 

It is ...................................................................................................................................

18. His parents had an impression on visiting his girlfriend’s house. 

It’s ....................................................................................................................................

19. I’m sure that I can keep my promise. 

I am ..................................................................................................................................

20. Japanese is difficult to learn. 

It is ...................................................................................................................................

21. Participating in this organization is not easy for him. 

It is ...................................................................................................................................

22. Ngoc and Vy usually reuse those pieces of used paper for drafts. 

Those pieces of used paper................................................................................................

23. Corona Virus stopped us from going to school 2 weeks ago. 

We .....................................................................................................................................

24. You’d better smoke outside. 

Would you mind .................................................................................................................

25. In the library, someone keeps silent to be a polite person. 

It’s ....................................................................................................................................

26. Our school asked all of students to wear medical masks to prevent Corona virus.  All of students ....................................................................................................................

27. That lantern is very cheap because it is made of paper. 

That lantern........................................................................................................................

28. The girl is my friend. She is riding the red bicycle. 

The girl ..............................................................................................................................

29. The picture was painted by Leonardo D. Vinci. It is hung over there. 

The picture .........................................................................................................................

30. Keeping personal hygiene is a good way for you. 

It’s ....................................................................................................................................

Các bạn giúp mình với! Mình đag cần gấp. Cảm ơn các bạn nhiều

Unit 9,10,11

IV. REWRITE

1. Please don’t smoke in this room.

Would you mind ................................................................................................................

2. Could I turn the air conditioner on?

Would you mind ................................................................................................................

3. Could I have his telephone number?

Do you mind .....................................................................................................................

4. Can I participate in Y & Y organization?

Do you mind.......................................................................................................................

5. Will you permit me to go to BTS’s concert tonight?

Would you mind .................................................................................................................

6. A thief stole my car last night.

My car ..............................................................................................................................

7. His friends draw these pictures.

These pictures....................................................................................................................

8. Nha Tran didn’t win the prize last summer.

The prize............................................................................................................................

9. They make shoes in that factory.

Shoes ................................................................................................................................

10. They also speak German at EU meetings.

German ..............................................................................................................................

11. The boy is a millionaire. He is sitting opposite us is a millionaire.

The boy...............................................................................................................................

12. The man is my uncle. He is standing at the door is my uncle.

The man............................................................................................................................. 13.The house belongs to Ms Jane. It was built last week.

The house...........................................................................................................................

14. The street is very wide. It leads to the school is very wide.

The street .........................................................................................................................

15. The system is very successful. It was used here.

The system ........................................................................................................................

16. This machine is easy to use.

It is ...................................................................................................................................

17. Some words are impossible to translate.

It is ...................................................................................................................................

18. His parents had an impression on visiting his girlfriend’s house.

It’s ....................................................................................................................................

19. I’m sure that I can keep my promise.

I am ..................................................................................................................................

20. Japanese is difficult to learn.

It is ...................................................................................................................................

21. Participating in this organization is not easy for him.

It is ...................................................................................................................................

22. Ngoc and Vy usually reuse those pieces of used paper for drafts.

Those pieces of used paper................................................................................................

23. Corona Virus stopped us from going to school 2 weeks ago.

We .....................................................................................................................................

24. You’d better smoke outside.

Would you mind............................................................................................................

25. In the library, someone keeps silent to be a polite person.

It’s ....................................................................................................................................

26. Our school asked all of students to wear medical masks to prevent Corona virus.

All of students...............................................................................................................

27. That lantern is very cheap because it is made of paper.

That lantern........................................................................................................................

28. The girl is my friend. She is riding the red bicycle.

The girl ..............................................................................................................................

29. The picture was painted by Leonardo D. Vinci. It is hung over there.

The picture .........................................................................................................................

30. Keeping personal hygiene is a good way for you.

It’s ....................................................................................................................................

Các bạn giúp mình với ạ. Cảm ơn các bạn nhiều

Unit 9,10,11