Xét nửa đường tròn đg kính AB trên nửa mặt phẳng PAB chắn nửa đg tròn ,kẻ tiếp tuyến Ax và dây AC bất kì.Tia phân giác của CAx cắt nửa đg tròn tại D.Các tia AD ,BC cắt tạiE

a c/m tam giác ABE cân

b AC,BD cắt nhau tại K.c/m EK//Ax

c BD cắt Ax tại F.c/m AKEF là hình thang

d c/m nếu sinBAC=1/2 thì AK= 2 CK

hoàn thành sơ đồ chuyển hóa sau

Fe₂O₃ --->FeCl₃ ---> Fe(NO₃)₂ ---> Fe(OH)₃ --->Fe₂O₃

1. He said: “I shall expect her.”

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2. He said: “I can’t find my hat.”

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3. She said: “I am going to the movies tomorrow.”

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4. Lan said to me: “You are looking much better.”

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5. He says: “The river is rising early this year.”

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6. She said to me: “I will do it if necessary I can.”

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7. He said to his friend: “Did you see the accident yesterday?”

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8. John said to me: “How did you come here?”

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9. He said: “Have you finished your task, Nam?”

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10. He said: “Yesterday evening I met Nam. He has bought a new car.”

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11. She said to me: “Who is this book?”

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12. Nam said to his father: “Please let me go to Paris.”

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13. He said to me: “Do you like to live in Orange Country?"

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14. My friend asked me: “Have you a lot of money?”

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15. He said: “I can’t meet you here either today or tomorrow.”

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16. They said: “We did it yesterday.”

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17. "If I were you, I’d read the exam questions very carefully." Teacher said.

Teacher advised Minh ____________________________________________________

18. "You had better not waste your time, Betty." Tom said.

Tom advised____________________________________________________________

19. “Shut the door but don’t lock it.” I said to him.

I told __________________________________________________________________

20. "I image I’ll see Sue at the party." John said.

John hoped______________________________________________________________

21. "Don’t forget to give the book to Jane." David said.

David reminded__________________________________________________________

22. Before Tim went to bed, his father said, "Don’t forget to brush your teeth."

Before Tim went to bed, his father reminded___________________________________

23. "Is this your new calculator, Mai?" Nam asked.

Nam __________________________________________________________________

24."Tell me what you saw at the party yesterday?" I said to Tom.

I ____________________________________________________________________

27. I said to John, “Why aren’t you looking for a job?”

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28. Nancy said: “Why didn’t you call me, John?"

Nacy wanted___________________________________________________________

29. “Remember to give your parents my regard, Lan.” Nam said.

Nam said______________________________________________________________

30. “Teacher, give us better marks, please.” the puplis said.

The pupils_____________________________________________________________

31. Mr Smith said to her: "Where will you go on your vacation?”

Mr Smith asked_________________________________________________________

32. He said: “I am very proud of my parents, Daisy.”

He told________________________________________________________________

33. “Be modest if you are a good pupil, Lan.” said her mother.

Lan’s mother told her_____________________________________________________

34. “Can I use your phone?” he said to me.

He asked______________________________________________________________

35. "Whose car did you borrow last night?” I said to him.

I wondered_____________________________________________________________

36. "If I had any money, I'd buy you a drink." she said to me.

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37. "If I were you, I'd stop smoking." she said to her brother.

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38. "Can you lend me ten pounds?" said the boy to me.

The boy asked _________________________________________________________

39. “Don’t play with the matches!” I said to Jack.

I warned___________________________________________