Tìm các số nguyên dương x,y sao cho : (x^2+y^2)/xy-1 là số nguyên dương

Cho ΔABC có AB=3cm, AC=6cm. Đường phân giác trong của BAC cắt BC tại D. Biết BD=2cm. Tính độ dài DC

1. “ How many students are there in your class, Hoa?”. → I asked…………………………………………………………………………………………… 2. “ What sorts of food do they serve, Nam?”, Mo asked. → Mo………………………………………………………………………………………………. 3. “ How big are the classes ?” She asked me. → She asked……………………………………………………………………………………….. 4. “ What games do you often play, Son?”, Lan asked. → Lan……………………………………………………………………………………………… 5. “ What foreign languages do you study beside English?” Mo asked me. → Mo………………………………………………………………………………………………. 6. “ Try your best to study, son.”, Mrs Hoa said. → Mrs Hoa………………………………………………………………………………………… 7. “ Give your sister this book, Tom.”, John said. → John……………………………………………………………………………………………… HELP, CẢM ƠN + CÂU TRẢ LỜI HAY NHẤT ĐẦY ĐỦ ẠAAAA

Exercise 3: Put the verbs in brackets into the correct form. 1. If I (win) ………..…..a big prize in a lottery, I (give) …………..up my job. 2. If I (be) ………..sent to prison, you (visit) ………….me? 3. I (not drink) ………….that wine if I (be) ……………..you. 4. I (get) ………….a job easily if I (have) …………………..a degree. 5. Of course, I’m not going to give her a diamond ring. If I (give) …….her, she (sell) …………… it. 6. If we (work) ……………….all night we (finish) ……………………in time, but we have no intention of working all night. 7. Look at poor Tom trying to start his car by hand again. If I (be) …………………Tom, I (get) ………………….. a new battery./. quả pin/ bình ắc qui. 8. I’d go to see him more often if I (live) ………………nearer. 9. If I knew you were right, I (agree) …………………………..with you. 10. If I (win) ……………..a lot of money, I would give up my job. 11. I (buy) ………………..shares in that company if they were cheaper./. share (n) cổ phần, thị phần. 12. If I (know) his phone number, I would call him. 13. I (not buy) this coat if I were you. 14. If She (come) late again, she’ll lose her job. 15. I (help) you if I could, but I’m afraid I can’t. 16. If I (have) wings, I (not, have to) take an airplane. 17. We would need less money if we (live) in the country. 18. If it (be) fine tomorrow, we will go to the coast (bờ biển). 19. We (phone) you if we have time. 20. If it didn’t rain, I (come) to see you. 21. I (drive) to work if I had a car. 22. Where in Vietnam would you like to live if you (can) choose? 23. If the weather (be) good, we will have lunch outside. 24. If the company offers me a job, I think I (take) it. 25. Many people would be unemployed if that factory (close) down. 26. If you finish before 4.30, I (come) and pick you up. =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… =>…………………… 27. If it’s hot, we (go) ............................................................................................ for a swim. 28. You’ll be really tired tomorrow if you (not go) ................................................................. 29. If someone (lend) ....................................................... you a bike, you can come with us. 30. If I had some spare money, I (buy) .............................................................. a DVD player. 31. If we (not work) ........................................... so hard, we wouldn’t be so tired all the time. 32. If she didn’t take so long in the shower, she (have) ....................... more time for breakfast. 33. If he (not drink)................................................... so much beer, he wouldn’t be so fat. 34. We could go traveling across France if we (have) ............................................ the change. 35. If I understood more about computers, I (be able to) ..................................... help you. Exercise 4. Write a sentence with “if…” for each situation. Use a type 2 conditional (if+ S+Ved/V2+…, S + would/ could/…+ V +…). 1. I’m not rich, so I don’t live in a big house. =>................................................................... 2. We don’t visit you very often because you live so far away. =>......................................... 3. Sandra can’t take a photo because she hasn’t got her camera. =>.................................................. 4. She buys a lot of clothes, so she has no money. =>............................................................ 5. I have to work tomorrow evening, so I can’t meet you. =>.................................................... 6. It’s raining, so we can’t have lunch in the garden. =>.............................................................. 7. I’m often tired in the morning because I go to bed late.=>................................................. 8. We haven’t got a calculator, so we can’t work this out quicker. =>................................................ 9. Nick can’t find the way because he hasn’t got a map. =>............................................................ 10. David has so many accidents because he’s so clumsy. =>................................................................ 11. I don’t write to my friends because I’m so busy. =>................................................................. 12. Susan hasn’t got a watch, so she’s often late for work. =>.............................................................. 13. He coughs a lot because he smokes forty cigarettes a day. =>..............................................

Giúp mình câu 1 với, mình cảm ơn nhiều ạ

Their talk sometimes (last) ...... For several hours

EM CẢM ƠN TRC Ạ Tính CM của các ion trong dung dịch H2SO4 có pH=3. Cần pha loãng dung dịch này bằng bao nhiêu lần bằng dung dịch NaOH có pH=12 để thu được dung dịch mới có pH=5.

Hình thang ABCD có đáy AB = 22,5cm, đáy CD = 33,75 cm và diện tích hình thang là 450 cm2. Đường chéo AC cắt BD tại I. Tính diện tích tam giác CID.

Bài 3 : Cho tam giác ABC cân tại A. Trên cạnh AB lấy điểm D, trên cạnh AC lấy điểm E sao cho AD = AE. Gọi M là giao điểm của BE và CD.Chứng minh: a) Các hình chiếu của BD và CE trên BC bằng nhau. b) BE = CD. c)tam giác BMD = tam giác CME d) AM là tia phân giác của góc BAC. e)BE nhỏ hơn BC + DE chia 2

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