Hấp thụ hoàn toàn 5,6 lít CO2 vào dung dịch 85,5 gam dung dịch Ba(OH)2. Sau phản ứng lọc tách kết tủa thu được dung dịch có khối lượng 39,95 gam. Tính nồng độ phần trăm của dung dịch Ba(OH)2

Cho đường tròn tâm O đường kính AB, lấy điểm C thuộc đường tròn tâm O, với điểm C không trùng A và B. Gọi I là trung điểm của dây AC, D là giao điểm của tia OI và tiếp tuyến của đường tròn tâm O tại A.

a) Chứng minh tam giác ABC vuông.

b) Chứng minh DC là tiếp tuyến của đường tròn tâm O. Chứng minh DC²=DI.DO

c) Tia phân giác của góc BAC cắt dây BC tại điểm E và cắt đường tròn tâm O tại F, với F không trùng với A. Chứng minh rằng FA.FE=FB²

Bài 2 ạ giúp mình với

13. Mrs Scott is proud of her cooking.  TAKES

14. Mrs Scott …………………………………………………………………………….

15. Doing the same things every day gives me no pleasure.        ENJOY.

=> I ………………………………………………………………………………………

16. Cheaper tickets are available from some travel agents.

=>  Some travel ………………………………………………………………………….

17. There are usually long waits at the airport.

=> You usually have ……………………………………………………………………..

18. My brother usually washes the dishes. (washing)

=> My brother ……………………………………………………………………………

19. I met her during my stay in London last summer. (staying)

=> I met ………………………………………………………………………………….

20. We had a choice of three main courses for dinner. (choose)

=> We could …………………………………………………………………………......

21. Could you speak English when you were younger? (able)

=> When you were ……………………………………………………………………...?

22. Three hundred students entered the swimming competition last year. (part)

=> Three hundred students ………………………………………………………………

23. My sister doesn’t like computer games very much. (keen)  

=> My sister ……………………………………………………………………………...

24. I was really bored by the film last night. (boring)

=> I  found ……………………………………………………………………………….

   25. It’s not a good idea to travel during the rush hour.

=> It’s better to avoid ……………………………………………………………………

26. As a child, I liked chocolate very much.

=> When I ……………………………………………………………………………….

27. In the briefcase you will find a map, a file and a calculator.         

=> The briefcase …………………………………………………………………………

28. Are you sure that  jacket is the right size for you?

=> Does that jacket ……………………………………………………………………..?

29. There may be some delay in  obtaining the permit.

=> Perhaps there …………………………………………………………………………

30. I gave Ted  the message, but he already knew about it.

=> I needn't ………………………………………………………………………………

31. He is a fascinating(hấp dẫn, lôi cuốn ) lecturer because he knows a lot about  his subject.

=> His wide …………………………………………………………………………….....

32. John doesn't always speak the truth, I'm  afraid.

=> You can't ……………………………………………………………………………….

33. Your hair is long . You ought to get it cut.

=> Your hair is long. It …………………………………………………………………….

34. Does this camera belong to you ?

=> Do …………………………………………………………………………………......?

35. He never has enough money.

=> He is always ……………………………………………………………………………

36. The food in France is famous.

=>  France is ……………………………………………………………………………….

37. She didn't say a word as she left the room.

=> She left the room ……………………………………………………………………….

38. Minh will be eighteen next week.

=> It’s Minh’s ……………………………………………………………………………...

39. Vinh keep forgetting is homework      .

=> Vinh is ………………………………………………………………………………….

40. Walking in the rain gives my brother pleasure.

=> My brother enjoys ……………………………………………………………………...

41. My friend had excellent ideas. He did a good job,too. (using not only.....but...as well )

      => My friend not only had excellent ideas but did a good job as well.

42. His explanation is not clear. The examples he gives are not clear. (using neither...............nor)

=> Neither …………………………………………………………………………………

      43. He was given a gift. So were you.(using "as well")

      => He ………………………………………………………………………………………

44. He made a great discovery. He was very proud of it.( Combine into one sentence)   => He ……………………………………………………………………………………

45. Lan found it difficult to accept the situation. ( rewrite with: difficulty)

=> Lan …………………………………………………………………………................

46.The farmers had applied new technology in their fields. The output of rice was raised.(Combine with: Thanks to ...........which............)

=> Thanks ………………………………………………………………………………..

47. She didn't say a word as she left the room.

=> She left the room ………………………………………………………………………

48. A train leaves at 7 o'clock every morning.

=> There is ………………………………………………………………………………..

49. During dinner, the phone rang.

Bài 6:Tìm các giá trị của m để phương trình có 2 nghiệm:

  1)(m-1)x² - 2x +3=0 cùng dấu                                    2)mx²-(5m-2)x+6m-5=0 có hai nghiệm đối nhau

Bài 8:Tìm các giá trị của m để phương trình có hai nghiệm x²-2(m-1)x+m-3=0 có hai nghiệm trái dấu vá giá trị tuyệt đối

Bài 9:Tìm các giá trị của m để phương trình có hai nghiệm đối nhau:

  a)x²-(2m+3)x+m²+3m + 2=0

Fill in with a suitable word from the given word in Italic

  cover   make    cast  carve               craftmen    draw         embroider       mould    weave

1. Every region has a different quality of clay, varnish color, ………moulding  and burning technique in pottery making.

2. Recently, Southeast Asia's largest bronze statue of the Buddha erected in Bai Dinh pagoda was…..cast  by artisans from Van Diem bronze village.

3……Knitting   silk was one of the women's chores 3.000 years ago.

4. At the beginning of the 20th century, Vietnamese artists used lacquering techniques to draw and ……carve pictures for decorations.

5. In the early 20th century, most houses, beds, and household were…… made from bamboo and rattan.

6.With only needles and colorful rolls of thread, craftswomen…….. embroider  silk pictures, usually of natural wonders such as birds, plants, or landscapes.

7. Conical hats are……covered         by using young palm leaves along a circular bamboo frame.

8. In Dong Ho Village (Bac Ninh) or Sinh Village (Hue), the painter who……draws the folk picture is a craft village farmer.

9. In 1990, due to the change of economic situation, Dong Ho paintings were difficult to sell and many…cra

quit their job.

10. The four – ton statue of hero Tran Vu , ……….cast     in 1667, still stands in Quan Thanh temple .