I.Combine these sentences using relative clause.

1. Here is the book.It is on wild animals.

2. These are the picture books. They interest the pupils.

3. Jack has many dictionaries. They are kept for reference.

4. The large room is the library. It is near the laboratory.

5. The long table is for reading. It is in the middle of the room.

6. The books are for reference. They are on the stacks near the librarian.

7. We saw the reader. The reader was reading a newspaper.

8. I met a man. His sister works in television

9. This library is free for the teachers staff. They come here to do research.

10. A girl was injured in the accident. She is now in hospital.

11. I found a cat. The cat's leg was broken

12. That is the woman. She kept this library.

13. This is the boy. I told you about him ( This is the boy whom/ that I told you about)

14. The man turned out to be my friends's father. He sat next to me on the bus.

15. Ann is very friendly. She lives next door.

16. We stayed at the Grand Hotel. Ann recommend it to us.

17. John is one of my closet friends. I have known him for a very long time.

18. Shiela is away from home a lot. Her job involves a lot of traveling.

19. We often go to visit our friends in Bristol. It is only thirty miles away.

20. The young man came to see me about the job. His father used to be my neighbour.

Chứng minh rằng:

\(\frac{n^2+n+1}{n^4+n^2+1}\) ( n thuộc N*) không là phân số tối giản

Cho tam giác ABC nhọn với 3 đường cao AL,BP,CQ cắt nhau ở D. Nối LP cắt CD ở E. Gọi M,N lần lượt là trung điểm của BD,CD.

a) Cm: MN AL và và

b) Cm: ~ và EC.ED=EL.EP

c) Cm: AD.AL + CD.CQ = AC2

d) Cm: QD.QC=QE.QN

Mong các bạn giúp, mình xin cám ơn rất nhiều

Phân tích đa thức thành nhân tử:

x⁴ - 4x³ + 9x² - 10x + 6

Gấp nhé, mong có ai đó giúp e

Cho tam giác ABC nhọn với 3 đường cao AL,BP,CQ cắt nhau ở D. Nối LP cắt CD ở E. Gọi M,N lần lượt là trung điểm của BD,CD.

a) Cm: MN \(\perp\)AL và \(\widehat{MQC}\) và \(\widehat{BPN}\)

b) Cm: \(\Delta BPL\) ~ \(\Delta BCD\) và EC.ED=EL.EP

c) Cm: AD.AL + CD.CQ = AC²

d) Cm: QD.QC=QE.QN

Mong các bạn giúp, mình xin cám ơn rất nhiều

1. Study on line saves time. --> It doesn't.....................................................

Người ta đổ một lượng nước sôi vào một bình chứa 2kg nước ở nhiệt độ 20^oC. Sau khi cân bằng nhiệt thì nhiệt độ của nước trong bình là 40^oC. Tính khối lượng nước sôi đổ vào bình. Biết nhiệt dung riêng của nước là 4200J/kg.K ( Bỏ qua sự trao đổi nhiệt với môi trường bên ngoài và bình )

Cho hình bình hành ABCD, đường phân giác góc D cắt AB tại M, đường phân giác góc B cắt CD tại N, kẻ MG vuông góc với BN tại H và NE vuông góc với DM tại E.Chứng minh:

a) AM=AD

b) MBND là hình bình hành

c) Tam giác MHB = Tam giác NED

Cho tứ giác ABCD. I là trung điểm AB, qua A kẻ đường thẳng song song với ID cắt CD ở E, qua B kẻ đường thẳng song song với IC cắt CD ở F, diện tích của tứ giác ABCD=60

I.Rewrite each of these sentences keeping the meaning unchanged.

1. The Greens family moved to Ho Chi Minh City in 2002. The Greens...............

2. It's five years since she last saw him. We haven't...............

3. The last time she visited our village was in 1992. She has...............

4. This is the first time I have eaten nachos in the USA. I have.....................

5. Minh bought his Canon digital camera in 2001.

Minh has..... .....

6. I last saw you when we were in senior high school. I have..............

7. When she heard the results, Mary began to feel more confident. Since hearing...............

8. When did you begin studying information technology? How long...............

9. How long have Emma and David been maried? When.................

10. There is a definite improvement in your work. Your work has.........................

11. I am on the tenth page of his letter I am writing. So far...............

12. When I lived on England, cycling to work was part of my daily routine. I used to.................

13. The red book is more expensive than that blue book on the shelf. That blue book................

14. She is always a better performer than her mother used to. Her mother never used to give..............

15. Miss Huong Tram is the best student in this class. No one..................

16. My close friend cannot run as fast as me. I am a..................

17. In class 6A, Minh is the most intelligent student. No.........................

18. No other members in the club are as tall as Lucie. Lucie is....................