Cho hình chữ nhật abcd.gọi M,N,K lần lượt là trung diểm AH,BH,CD trong đó H là hình chiếu vuông góc của B lên AC
1 chứng minh rằng tứ giác MNCK là hình bình hành.
2 chứng minh rằng N là trực tâm tam giác BCM.
3 chứng minh rằng tứ giác BMKC nội tiếp
4 Đường tròn nội tiếp tứ giác BMKC cắt AB tại I( I khác B ).Chứng mình rằng 2AI^2=AM.AC
o l m . v n
Câu hỏi
cho hình chữ nhật abcd.gọi M,N,K lần lượt là trung diểm AH,BH,CD trong đó H là hình chiếu vuông góc của B lên AC
1 chứng minh rằng tứ giác MNCK là hình bình hành.
2 chứng minh rằng N là trực tâm tam giác BCM.
3 chứng minh rằng tứ giác BMKC nội tiếp
4 Đường tròn nội tiếp tứ giác BMKC cắt AB tại I( I khác B ).Chứng mình rằng 2AI^2=AM.AC
Kết hợp những câu sau dùng đại từ quan hệ.
1. Alice is my friend. Alice’s mother died last year.
2.The boy will be punished. He threw that stone.
3. Ann is very friendly. She lives next door.
4.The man is a famous actor. You met him at the party last night.
5.There are some words. They are very difficult to translate.
6.I was looking for a book this morning. I’ve found it now.
7.Is that the car? You want to buy it.
8.Sandra works in advertising. You were talking to her.
9.The little girl ate sweets the whole way. She sat next to me on the coach.
10.Lan is a journalist. Her tape recorder was stolen.
11.I don’t know the name of the woman. I spoke to her on the phone.
12. We often go to visit our friends in Bristol. It’s only 30 miles away.
13. This is Mr Carter. I was telling you about him.
14. That is the room. The meeting is held in that room.
15. I’ll always remember the day. I first saw that sight on that day.
16.She was born in Malaysia. Rubber trees grow well there.
17.No one knows the school. My uncle taught at that school 10 years ago.
18. Please ask them the time. The train stared the trip at that time.
19. New Year’s Day is a day. All family members gather and enjoy a family dinner then.
20. There are many hotels. Tourists can enjoy their holidays there.
21.India is a country.The earthquake occured in this country last month.
22. Bac giang is a city. I was born and grew up there.
23. We have not decided the day. We’ll go to London on that day.
24. The man made me sad the most. I love him with all my heart.
25.The thief was caught. This was a really good news.
26. The gentleman was very young. He was introduced as the most successful businessman.
27. His book became the best seller.It was punished last year.
28. Neil Armstrong lived in the USA. He walked on the moon.
29. Nam is very intelligent. He learns in our class.
30. Ha Long has grown into a big city over the past few years. I visited the city last year.
Chuyển những câu sau sang câu gián tiếp.
1. He said to her, “You are my friend.”
2. Johnny said to his mother, “I don’t know how to do this exercise.”
3. “ Don’t come back before one o’clock”, advised my brother.
4. “Cook it in butter”, Mrs Brown said to her daughter.
5. The pupils said “ Teacher, give us better marks, please.”
6. My friend said, “ Are you going to leave tomorrow?”
7. “ Have you done your homework?”, said my mother.
8. I asked Bill,” What time did you go to bed last night?”
9. Paul said, “ I must go home now.”
10. “ There is an accident .”, said the policeman.
11. “ We are waiting for the school bus”, said the children.
12. “ Must you go now?”, said Mr Brown.
13. “ Are you going to visit your aunt tomorrow?” asked Tom.
14. “ Listen to me and don’t make a noise,”said the teacher to his students.
15. “ I’m tired of eating fish”, said Mary to Helen.
16. “ The sun always rises in the east,” said Peter.
17. “ I didn’t steal your fur coat yesterday,” said Samny to Jean.
18. “ You must do your homework everyday”, said Miss Lan to us.
19. “ Will we read the story?”, Bill asked his teacher.
20. “ I don’t know where Alice is,” said Vicky.
21. “ There isn’t much rain in the south of the country,” said Harry.
22. “ Would you mind turning the music down?”Andrew said to Anne.
23. “ How much do you think it will cost?” He asked.
24. “ Can you speak more slowly? I can’t understand,” He said to me.
25. “ Have you already reviewed all your lessons?” she said to me.
26. “ Come in and look around. There’s no obligation to buy,” said the shopkeeper.
27. “ I’m sorry I’m late,” she said.” The bus broken down”
28. Mary asked me “ Can you tell me why you are so sad?”
29. “ Will you please find out when he last wrote to me?” Jane said to her friend.
30. “ You must decide what you want to do”, she said to her daughter.
Viết phương trình đường thẳng đi qua hai điểm sau:
a) A 1;2 và B (-2;-1)
b) M 2;1 và(- 2; -7).
Bài 4 ) Tìm giao điểm của hai đường thẳng:
a) (d 1 ): 5x -2y = c và (d 2 ) : x + by = 2, biết rằng (d 1 ) đi qua điểm A(5;-1) và (d 2 ) đi qua điểm B(– 7; 3)
b) (d 1 ): ax + 2y = -3 và (d 2 ) : 3x -by = 5, biết rằng (d 1 ) đi qua điểm M(3;9) và (d 2 ) đi qua điểm N(– 1; 2)
Bài 5 )Cho tam giác vuông tại A (AB<AC) nối tiếp đường tròn (0) đường kính BC. Kẻ dây AD
vuông góc BC Gọi E là giao điểm của DB và AC. Qua E kẻ đường thẳng vuông góc với BC, cắt BC
tại H, cắt AB tại F.
a) Chứng minh tam giác EBF cân và tam giác HAF cân
b) Chứng minh: HA là tiếp tuyến của đường tròn (0)
Bài 6 )Từ điểm A ngoài đường tròn (O,R) với OA = 2R kẻ tiếp tuyến AB
a) Tính AB theo R
b) Kẻ dây BC vuông góc với OA tại H
Chứng minh: AC là tiếp tuyến của đường tròn (O)
a) CM: Bốn điểm A,B,O,C cùng thuộc một đường tròn, xác định tâm I của đường tròn đó.
b) Tia A0 cắt đường tròn (0) tại F (F I). Chứng minh BF là tiếp tuyến của đường tròn tâm I bán kính IBViết phương trình đường thẳng đi qua hai điểm sau:
a) A 1;2 và B 2; 1 .
b) M 2;1 và N2; 7 .
Bài 4 ) Tìm giao điểm của hai đường thẳng:
a) (d 1 ): 5x 2y = c và (d 2 ) : x + by = 2, biết rằng (d 1 ) đi qua điểm A(5;1) và (d 2 ) đi qua điểm B(– 7; 3)
b) (d 1 ): ax + 2y = 3 và (d 2 ) : 3x by = 5, biết rằng (d 1 ) đi qua điểm M(3;9) và (d 2 ) đi qua điểm N(– 1; 2)
Bài 5 )Cho tam giác vuông tại A (AB<AC) nối tiếp đường tròn (0) đường kính BC. Kẻ dây AD
vuông góc BC Gọi E là giao điểm của DB và AC. Qua E kẻ đường thẳng vuông góc với BC, cắt BC
tại H, cắt AB tại F.
a) Chứng minh tam giác EBF cân và tam giác HAF cân
b) Chứng minh: HA là tiếp tuyến của đường tròn (0)
Bài 6 )Từ điểm A ngoài đường tròn (O,R) với OA = 2R kẻ tiếp tuyến AB
a) Tính AB theo R
b) Kẻ dây BC vuông góc với OA tại H
Chứng minh: AC là tiếp tuyến của đường tròn (O)
a) CM: Bốn điểm A,B,O,C cùng thuộc một đường tròn, xác định tâm I của đường tròn đó.
b) Tia A0 cắt đường tròn (0) tại F (F I). Chứng minh BF là tiếp tuyến của đường tròn tâm I bán kính IB .
b) M 2;1 và N2; 7 .
Bài 4 ) Tìm giao điểm của hai đường thẳng:
a) (d 1 ): 5x 2y = c và (d 2 ) : x + by = 2, biết rằng (d 1 ) đi qua điểm A(5;1) và (d 2 ) đi qua điểm B(– 7; 3)
b) (d 1 ): ax + 2y = 3 và (d 2 ) : 3x by = 5, biết rằng (d 1 ) đi qua điểm M(3;9) và (d 2 ) đi qua điểm N(– 1; 2)
Bài 5 )Cho tam giác vuông tại A (AB<AC) nối tiếp đường tròn (0) đường kính BC. Kẻ dây AD
vuông góc BC Gọi E là giao điểm của DB và AC. Qua E kẻ đường thẳng vuông góc với BC, cắt BC
tại H, cắt AB tại F.
a) Chứng minh tam giác EBF cân và tam giác HAF cân
b) Chứng minh: HA là tiếp tuyến của đường tròn (0)
Bài 6 )Từ điểm A ngoài đường tròn (O,R) với OA = 2R kẻ tiếp tuyến AB
a) Tính AB theo R
b) Kẻ dây BC vuông góc với OA tại H
Chứng minh: AC là tiếp tuyến của đường tròn (O)
a) CM: Bốn điểm A,B,O,C cùng thuộc một đường tròn, xác định tâm I của đường tròn đó.
b) Tia A0 cắt đường tròn (0) tại F (F I). Chứng minh BF là tiếp tuyến của đường tròn tâm I bán kính IB
Bài tập : Chia động từ trong ngoặc.
1. If you ( go) __________away, please write to me.
2. If you ( be)__________ in, I should have given it to you.
3. If he (eat) __________another cake, he will be sick.
4. I ( not do ) __________ that if I (be) __________you.
5. If he (take) __________my advice, everything can go well.
6. I would have come sooner if I ( know)__________ you were here.
7. He never does homework. If he( do)_____ his homework, he(not worry)____about his exam.
8.It’s too bad we lost the game. If you (play)__________ for us, we( win)__________.
9.What you (do) __________if she refuses your invitation?
10. If today (be) __________Sunday, we (go)__________ to the beach.
11. Unless they (pass) __________their examinations, they would join the army.
12. You (be) __________ill if you drink that water.
13. If Tom (go)__________ to bed earlier, he would not be so tired.
14. Had we known your address, we( write) __________you a letter.
15. If it’s raining heavily, we (not go) __________for a donkey ride. 16. If he (try)__________ hard, he’ll pass the examination.
17. I could understand the French teacher if she (speak)__________ more slowly.
18.If she (not be)__________ busy, she would have come to the party.
19. If I (finish) __________the work in time, I ( go)__________ to the football game.
20. If you( see) __________Mary today, please ( ask) __________her to call me.
21. She wishes her father ( be)_______________ here now to help her
22.I wish they ( visit) _______________us when they were in town.
23.I wish someone ( give) _______________ me a job next month.
24.If only I ( can take) _______________the trip to Hanoi with her next summer.
25.I wish they ( know) _______________the truth yesterday.
26. I wish I (see) _______________ that film on TV again.
27.We wish she (be) _______________ our teacher of English.
28.My brother wishes he (not waste) _______________ time when he was young.
29.They wish they (come) _______________ to class on time yesterday morning.
30. I wish I ( spend) _______________my last summer vacation in the mountains.
31.I wish she (come) _______________ to see me yesterday.
32.If only I ( have) _______________more time to do this job.
33.He missed an exciting football match on TV last night. He wishes he (watch) ____________ it.
34.I wish you ( not give ) _______________them my phone number yesterday.
35.We wish we ( understand) _______________all the teacher’s explanation yesterday.
* Viết lại những câu sau sao cho nghĩa của câu không thay đổi.
1. What a pity the weather isn’t nice._________________________________________
2. Your cousin doesn’t tell you the truth. _________________________________________
3. I’m sorry you don’t study hard. _________________________________________
4. I can’t lend you any money. _________________________________________
5. What a pity he doesn’t invite us to the party. ____________________________________
6. I’m sorry I can’t easily give the answer. _________________________________________
7. Tom isn’t here now. _________________________________________
8. We don’t buy that house. _________________________________________
9. They never visit us. _________________________________________
10. She is often late for school. _________________________________________
11. That man doesn’t work hard.He can’t earn more money.
12.I don’t tell him the answer because he is from home.
13. My friend and I don’t have enough money , so we will not buy a house of our own.
14. The weather isn’t better now, so we can’t go for a walk.
15. I don’t know his address, and I don’t give it to you.
16.He does not work slowly enough, so he makes many mistakes.
17. I am not sent to prison. She doesn’t visit me
18. I don’t win a big prize in a lottery, so I don’t give up my job.
19. The doctor can’t see many patients because he is so late.
20. We don’t visit them in Hanoi because tickets are expensive.
* Chia động từ trong ngoặc ở thì thích hợp.
1.Be quiet ! The baby ( sleep)
2. The sun ( set) in the West.
3.Mr Green always ( go) to work by bus.
4. It ( not rain ) in the dry season.
5. They ( have ) lunch in the cafeteria now.
6. My little sister ( drink) milk every day.
7. The doctor sometimes ( return) home late.
8. He ( write) a long novel at present.
9. Look ! The bus ( come).
10. The earth (move) around the sun.
11.Sometime ( smell) good in the kitchen now.
12.His uncle ( teach) English in our school five years ago.
13. The old man( fall) as he (get) into the bus.
14. When I saw him, he (sit) asleep in a chair.
15. There (be) a lot of noise at the fair yesterday.
16. It (take) me 5 minutes to walk to school last year.
17.They ( not speak) to each other since they quaralled
18. I (try) to learn English for years, but I ( not succeed) yet
19.I (not see) her since last week.
20. John( do) his homework already.
21.The train (start) before we arrived at the station.
22. There (be) an English class in this room tomorrow evening.
23. The film already (begin) when we got to the cinema.
24. You (stay) at home tonight?
25.I( be) twenty years old next June.
26.Where are you?- I’m upstairs. I (have) a bath.
27.All of them (sing) when I( came).
28.What you( do) at 7 p.m yesterday?
29. Where you ( spend) your holiday last year?
30. Why didn’t you listen while I (speak) to you?
31.A: I …………( not see) Andrew for weeks.
B: Nor me, It’s weeks since I last …….( see) him.
32.A: What……( you/do) last night?
B: Well, I ……..( be) very tired, so I …..( go) to bed very early.
33.A: ……….( you/ meet) Julie recently?
B: Yes, I …….(see) her a few days ago.
34. A: Are you still playing tennis?
B: No, I …..( not be) able to play tennis since I (break) my arm.
35. A: What part of birmingham. ( you/live) when you …..(be) a student?
B: A place called Selly Oak ………( you/ever/be) there?