Cho O là trung điểm của AB , trên cùng một nửa mặt phẳng chứa AB vẽ tia Ax và By vuông góc với AB. Trên tia Ax lấy C , qua O kẻ đường thẳng vuông góc với OC 1) AB² =4AC.BD 2) Kẻ OM vuông góc với CD. CMR CO là phân giác góc ACD và AC=CM 3) Tia BM cắt Ax tại N . CMR C là trung điểm của AN 4) Kẻ MH vuông góc AB . CMR AD,BC,MH đồng quy

Lớp trẻ Việt Nam cần nhận ra những cái mạnh, cái yếu của con người Việt Nam để rèn những thói quen tốt khi bước vào nền kinh tế mới. Tết năm nay là sự chuyển biến giữa hai thế kỉ và hơn thế nữa, là sự chuyển tiếp giữa hai thiên niên kỉ. Trong thời khắc nhự vậy, ai ai cũng nói tới việc chuẩn bị hành trang bước vào thế kỉ mới, thiên niên mới. Trong những hành trang ấy, có lẽ sự chuẩn bị bản thân con người là quan trọng nhất. Từ cổ chí kim bao giờ con người cũng là động lực phát triển của lịch sử. Trong thế kỉ mà ai ai cũng thừa nhận rằng nền kinh tế tri thức sẽ phát triển mạnh mẽ thì vai trò của con người lại càng nổi trội. Cần chuẩn bị những cái cần thiết trong hành trang mang vào thế kỉ mới, trong khi chúng ta đã chứng kiến những huyền thoại của khoa học và công nghệ, sự giao thoa, hội nhập giữa các nền kinh tế chắc chắn sẽ sâu rộng hơn nhiều. Trong một thế giới nhự vậy, nước ta lại phải cùng giải quyết ba nhiệm vụ: thoát khỏi tình trạng nghèo nàn lạc hậu của nền kinh tế nông nghiệp, đẩy mạnh công nghiệp hóa, hiện đại hóa và đồng thời phải tiếp cận ngay với nền kinh tế tri thức. Làm nên sự nghiệp ấy đương nhiên là nững con người Việt Nam với những điểm mạnh và điểm yếu của nó. a. Đây có phải là văn nghị luận không? Vì sao? b. Để thuyết phục tác giả đưa ra những lí lẽ, dẫn chứng nào? c. Bài viết có nhằm giải quyết vấn đề có trong thực tế hay không? Em có tán thành với ý kiến của bài viết không? Vì sao?

X/ Supply the correct forms of the verbs. 1. I’m afraid I not (be) quite ready. – never mind. I (wait) 2. Now I (understand) what you are trying ( say). 3. What you (think) Tom (do) ?- he (tell) the truth to his parents. 4. You(wait) a minute while I (look) through the test ? 5. After the party tonight I (speak) to you about your future job. 6. I hear you’ve bought a new house.- yes. I (move) in next week.- you (have) warmming party?. – not just yet. I ( paint) the house first. 7. Don’t make too much noise. I (try) to do this math question. 8. I’m just going out ( get) an evening newspaper 9. at the moment we (sit) in a café, we 9 wait) for the museum to open,so I (write) some postcards. 10. miss Hellen (help) as soon as she (finish) that letter. 11. you ( go ) abroad for your holiday? – well, I (get) a holiday job. 12. – you ( remember) to lock the door? – Oh, my God! I (forget). 13. did you remember ( book) seat ? – Oh, no I (forget)…I (telephone) for them now. 14. I (not,want) to meet Paul so when he went into the room. I ( leave). 15. you (like) this necklace? I (give) it to my sister for her birthday tomorrow. 16. He (live) in London for two years and then (go) to Edinburgh, now he (live) in Manchester. 17. you(know) why an apple (fall) down and not up? 18. I ( have) a cold. Yesterday I (feel) terrible, but I’m feeling better today. 19. if she ( try) her best, she ( get) high marks this exam. 20. we ( not, write) him since last week.

Giúp mk với nhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

EX1 Choose the best option to complete each of the following sentences. 1. She decided to learn ________to sew. A. which B. what C. where D. how 2. My neighbor, Mrs Mai, bought the material and ________the dress for me. A. does B. made C. did D. makes 3. She made a cushion and a dress. The cushion was fine. But the dress________. A. was B. isn’t C. wasn't D. aren't 4. We ________Cham temples and Tri Nguyen Aquarium. A. visited B. looked C. came D. went 5. Please switch ________the radio. I want to listen to the news. A. off B. over C. in D. on 6. Helen is always afraid ________dogs. A. off B. with C. of D. by 7. Now Hoa has a useful hobby. She makes her own________. A. wears B. clothes C. cloth D. costumes 8. I bought a lot of ________for my friends, in America. A. presents B. gifts C. souvenirs D. All are correct Choose the underlined part that needs correcting. 9. They will return to England in the fifth of April. A. in B. will C. fifth D. to 10. We couldn't stay to dinner because the last bus leaves at 8 o'clock. A. at B. to dinner C. stay D. leaves EX2 Rewrite the following sentences to describe your old hobby. 11. Last summer / I / learn / play chess. 12. My neighbor / play / very well / and teach / me. 13. He / a teacher / the College of Technologies. 14. Then / I often / play chess / with my friends / free time. 15. Now / I / play / quite well. 16. I / think / chess / wonderful game. EX 3 Change into negative and interrogative sentences. 17. Liz bought many souvenirs in Ho Chi Minh City. 18. I was very tired after the trip. 19. They are watching my father’s new motorbike. 20. We visited Cham Temples last month. 21. Trung’s brother goes on holiday in Ha Long Bay every summer. 22. They will take their soon to the zoo next weekend. 23. My parents live in the countryside. 24. Tom gave me some American stamps five days ago. 25. Mrs. Oanh his our new literature teacher. 26. There was a toy store next to the museum. EX4 Read the passage and answer the following questions. My name is John, and this is my story. Last year just before Christmas my family and our cousin and uncle and aunt decided to go to Perth for holiday. We went in two cars but when we were about halfway there my uncle wanted to turn round and come back. He said it was too far, and it was terribly hot too, one day it was 480C. Even at night it was really hot. Anyway, what we decided to do was to drive back about 160 km to a place where the train went through. Then we put both cars on the train and we all went to Perth by train. That was fun. It was a good train. We had a good time in Perth but we had to cut our holiday short. You see, while we were there my grandmother (my mother’s mother) in Melbourne died. Most of us flew back but but my Dad and my uncle came on the train with the cars and then had to drive back to Melbourne from Port Pirie. It was a really strange holiday because nothing went the way we planned it. 27. When did John’s family go to Perth? 28. How did they go to Perth? 29. Why did John’s uncle decide to com back? 30. Who died when John’s family were on holiday? 31. How did most of them come back? EX5 Fill in each blank with one suitable preposition. 32. Hoa’s new skirt was white ________red and yellow flowers ________it. 33. Lien made a cushion ________her own room. 34. Nam lives a long way ________his grandparents’ house. 35. Liz helped me a lot ________my stamp collection. 36. Did you speak ________Mr. Robinson ________your vacation ________Dalat? 37. There is a souvenir shop near the exist ________the zoo. EX6 Fill in the gap with a correct verb in the box. looks–plant-thought- has -bought-planted- learn - watched Tung (39) _____his neighbor, Mr. Thuan (40)_____ trees in his garden. He (41)_____ planting trees was a good hobby. He decided to (42)_____ how to plant trees. He (43)_____ some small trees and (44)_____ them in front of his house. They had lots of green leaves and some little flowers. Now, he (45)_____ a small garden and it (46)_____ very pretty. EX7 Arrange these verbs pronunciaton “ed”. listened wrapped painted raised looked needed visited rained watched opened helped seemed learned practiced stopped remembered worked rented arrived talked lived liked invited received washed /t/ /d/ /id/ _________________ ___________________ ________________________ _________________ ___________________ ________________________ _________________ ___________________ ________________________ _________________ ___________________ ________________________ _________________ ___________________ ________________________ _________________ ___________________ ________________________ _________________ ___________________ ________________________ _________________ ___________________ ________________________

Este X được tạo thành từ glixerol và một axit cacboxylic đơn chức. Trong phân tử este có số nguyên tử cacbon bằng số nguyên tử oxi . Khi cho 8,8 gam X tác dụng với dung dịch NaOH dư thì lượng NaOH đã phản ứng là:

Giúp mình với mọi người ơi S = 1 + 2 + … + 99 + 100 + 99 + … + 2 + 1. Tính S

Đề là giải bpt nha mọi người ơi

Em hãy viết đoạn văn khoảng 10 câu giải thích câu tục ngữ " Không thầy đố mày làm nên " và " Học thầy không tày học bạn "

Tìm x thuộc Z, biết: a) -7 là bội của x+8 b) x- 2 là ước của 3x-13