1, Minh (check) cheked his teeth last month.

2, I want (ask) to ask you a few question.

3, Minh never (touch) touches unhealthy food.

4, She finished (fill) fills the cavity in his tooth in less than 10 minutes.

5 , I often wash my clothes and iron them (careful) carefully.

6 , I feel tired . My back is (pain) painfull.

7 , Don't use an old ( tooth ) toothpaste.

8 , I was a little ( scare ) scared, but the dentist was kind .

I. Chuyển các câu sau sang câu bị động:

1. Mary types letters in the office.

=> Letters are typed in the office by Mary.

2. His father will help you tomorrow.

=> You will be helped by his father tomorrow.

3. Science and technology have completely changed human life.

=> Human life has been completely changed by science and technology.

4. Peter broke this bottle.

=> This bottle was broken by Peter.

5. They are learning English in the room.

=> English is being learned in the room.

6. Nothing can change my mind.

=> My mind can't be changed.

7. No one had told me about it.

=> I hadn't been told about it.

8. I don’t know her telephone number.

=> Her telephone number wasn't known.

9. My students will bring the children home.

=> The children will be brought home by my students.

10. They sent me a present last week.

=> I was sent a present last week.

11. She gave us more information.

=> We were given more information.

12. The chief engineer was instructing all the workers of the plan.

=> All the workers of the plan were being instructed by the chief engineer.

13. They can’t make tea with cold water.

=> Tea can't be made with cold water.

14. Somebody has taken some of my books away.

=> Some of my books have been taken away.

15. They will hold the meeting before May Day.

=> The meeting will be held before May Day.

16. They have to repair the engine of the car.

=> The engine of the car has to be repaired.

17. The boys broke the window and took away some pictures.

=> The window was broken and some pictures were taken away by the boys.

18. People spend a lot of money on advertising every day.

=> A lot of money is spent on advertising every day.

19. Teacher is going to tell a story.

=> A story is going to be told by teacher.

20. Mary is cutting a cake with a sharp knife.

=> A cake is being cut with a sharp knife by Mary.

21. The children looked at the woman with a red hat.

=> The woman with a red hat was looked at by the children.

22. They have provided the victims with food and clothing.

=> The victims have been provided with food and clothing.

23. People speak English in almost every corner of the world.

=> English í spoken in almost every corner of the world.

24. You mustn’t use this machine after 5:30 p.m.

=> This machine mustn't be used after 5:30 p.m.

25. After class, one of the students always erases the chalk board.

=> After class, the chalk board is always erased by one of the students.

1, Make a noise.

2, Play a musical instrument.

3, Have a party.

4, Book theatre tickets.

5, Take photos.

a, Gọi số cần tìm là M (M thuộc N)
+ Nếu M = a^x  (a là số nguyên tố; x thuộc N*)

Vì M có 9 ước nên ta có:

x + 1 = 9

x = 9 - 1

x = 8 

=> M = a⁸

Mà để M là nhỏ nhất thì a phải là SNT nhỏ nhất.

=> a = 2

=> M = 2⁸ = 256  (*)

+ Nếu M = a^x.b^y (a, b là số nguyên tố; x, y thuộc N*)

Vì M có 9 ước nên ta có:

(x + 1)(y + 1) = 9

=> 9 chia hết cho x + 1

=> x + 1 thuộc Ư(9)

=> x + 1 thuộc {1; 3; 9}

Ta có bảng sau:

Vậy (x; y) = (2; 2)

=> M = a².b²

Mà M là nhỏ nhất => a = 2; b = 3.

=> M = 2².3² = 4.9 = 36 (**)

Vì 9 không thể tách thành tích của ít nhất 3 thừa số lớn hơn 1 nên M không thể tách thành tích của 3 số trở lên

Từ (*) và (**) ta thấy giá trị M = 36 là nhỏ nhất nên M = 36

Ex5: Find the word which has a different sound in the part bold. Read the words aloud:

1. A.country B.cloud C.loudly D.mouse

2. A.camel B.cattle C.paddy D.buffalo

3. A.populated B.loaded C.harvested D.lived

4. A.fields B.flowers C.lemons D.parks

A.normal B.visitor C.transport D.chore

4:3=tứ:tam=tám : tư=hai

\(10x=15y=6z\Rightarrow\frac{x}{3}=\frac{y}{2}=\frac{z}{5}=\frac{10x-15y+z}{10.3-15.2+5}=\frac{z}{5}\)

Đề bái có vấn đề bạn nhé

\(B=\left(\dfrac{\sqrt{5}+\sqrt{2}}{5-2}-\dfrac{\sqrt{5}-\sqrt{2}}{5-2}+1\right).\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\left(\dfrac{\sqrt{5}+\sqrt{2}-\sqrt{5}+\sqrt{2}}{3}+1\right).\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\left(\dfrac{2\sqrt{2}}{3}+1\right).\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\dfrac{2\sqrt{2}+3}{3}.\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\dfrac{\left(\sqrt{2}+1\right)^2}{3\left(\sqrt{2}+1\right)^2}\\ =\dfrac{1}{3}\)

1.A.Come B.Money C.Notebook D.Monday gach chan o

2.A.Couple B.Though C.Soul D.Elbow gach chan o,D gach chan ow

3.A.Does B.Cousin C.Son D.Grow gach chan o,B gach chan ou

4.A.Trouble B.Home C.Understand D.Courage gach chan A:ou ; B:o ; C:u ; D:ou

5.A.Luck B.Goes C.Soap D.Coast gach chan A:uc ;B:oe ;C:oa; D như C

=> He isn't watching TV.