Câu 1: Cho đường tròn (O) và đường thẳng d không giao nhau với đường tròn (O). Gọi A là hình chiếu vuông góc của O trên đường thẳng d. Đường thẳng đi qua A ( không đi qua O) cắt đường tròn (O) tại B và C (B nằm giữa A,C). Tiếp tuyến tại B và C của đường tròn (O) cắt đường thẳng d lần lượt tại D và E. Đường thẳng BD cắt OA, CE lần lượt ở F và M, OE cắt AC ở N. a) Chứng minh tứ giác AOCE nội tiếp b) Chứng minh AB.EN = AF.EC c) Chứng minh A là trung điểm DE

Các bạn ơi Các bạn giúp mình bài Vi-et với ạ Em cảm ơn

Tính nồng độ phần trăm của dung dịch MgCl2 thu được khi hòa tan 20 gam MgCl2 trong 480 gam nước. b) Hòa tan 17,1 gam Ba(OH)2 vào nước thu được 250 ml dung dịch Ba(OH)2. Tính nồng độ mol của dung dịch Ba(OH)2 thu được.

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1 lớp học có số học sinh tham gia học sinh giỏi của quận nếu lớp được tham gia thêm 2 bạn thì số học sinh dự thi bằng 1/4 số học sinh cả lớp. số học sinh còn lại nhiều hơn 1/2 số học sinh của lớp là 12 bạn . tính số học sinh cả lớp và số học sinh tham gia thi học sinh giỏi

1. Where ___________you (live)____________? I (live)______________in Hai Duong town. 2. What he (do) _________________now? He (water)_________________flowers in the garden. 3. What _______________she (do)_____________? She (be)______________a teacher. 4. Where _________________you (be) from? 5. At the moment, my sisters (play)____________volleyball and my brother (play) ________________soccer. 6. it is 9.00; my family (watch)___________________TV. 7. In the summer, I usually (go)______________to the park with my friends, and in the spring, we (have) _____________Tet Holiday; I (be)________happy because I always (visit) ______________my grandparents. 8. ____________your father (go)_____________to work by bus? 9. How ___________your sister (go)___________to school? 10. What time _____________they (get up)_________________? 11. What ____________they (do)________________in the winter? 12. Today, we (have)______________English class. 13. Her favourite subject (be)__________________English. 14. Now, my brother (like)_________________eating bananas. 15. Look! A man (call)_________________you. 16. Keep silent ! I (listen )____________________to the radio. 17. ______________ you (play)_________________badminton now? 18. Everyday, my father (get up)_______________at 5.00 a.m. 19. Every morning, I (watch)_________________tv at 10.00. 20. Everyday, I (go) __________to school by bike. 21. Every morning, my father (have) ______________a cup of coffe. 22. At the moment, I(read)_______________a book and my brother (watch)_______ TV. 23. Hoa (live)________________in Hanoi, and Ha (live)________________in HCM City. 24. Hung and his friend (play)_______________badminton at the present. 25. They usually (get up)___________________at 6. oo in the morning. 26. Ha never (go)___________fishing in the winter but she always (do)________ it in the summer. 27. My teacher (tell)__________________Hoa about Math at the moment. 28. There (be)____________________ animals in the circus. 29. _______________he (watch)______________TV at 7.00 every morning? 30. What _____________she (do ) _________________at 7.00 am? 31. How old _________she (be)? 32. How ___________she (be)? 33. My children (Go)________________to school by bike. 34. We (go)_______________to supermarket to buy some food. 35. Mr. Hien (go)________________on business to Hanoi every month. 36. Ha (like)______________coffee very much, but I (not like)______________it. 37. She (like )________________Tea, but she (not like)____________________coffee. 38. I (love)_______________ cats, but I (not love)__________________dogs. 39. Everyday, I (go)______________to school on foot. 40. Who you _________________(wait) for Nam? - No, I ___________ (wait) for Mr. Hai. 41. My sister (get)______________ dressed and (brush)_______________her teeth herself at 6.30 everyday. 42. Mrs. Smith (not live)_______________in downtown. She (rent)________________in an apartment in the suburb. 43. How _________your children (go)_________________to school everyday? 44. It's 9 o'clock in the morning. Lien (be)________in her room. She (listen) _______________to music. 45. We_______________________(play) soccer in the yard now. 46. My father (go)___________ to work by bike. Sometimes he(walk)______________. 47. _________You (live)________near a market? _ It (be)____________noisy? 48. Now I (do)__________the cooking while Hoa (listen)_____________to music. 49. At the moment, Nam and his friends (go)_______________shopping at the mall. 50. In the autumn, I rarely (go)_____________sailing and (go)__________to school. 51. I (write)_____________________________ a letter to my friend now. 52. At 12 a.m every day, I (have)____________lunch and (go)____________to bed. 53. On Monday, I (have)________________________ math and Art. 54. On Friday, she (have)______________________English. 55. At the moment, I (eat)__________an orange, and my sisters (play)_______tennis. 56. ______it her bag (be)? - No, it (not be)______________. 57. What time _____________your children (go)____________ to school? 58. He (live)________________in HCM City. 59. What time___________your brother usually (get)___________up? 60. My house (be)_________in the city and it (be)_________small. 61. Every morning, we (have)__________breakfast at 7.00 am. 62. This (be)________a book and there (be)_________pens. 63. Mr. Quang (live)____________in the countryside. He (have)__________a big garden. 64. John (not have)______________Literature lesson on Friday. 65. What time _________you (start)___________your class? 66. ___________you (be) in class 12A3? 67. Mrs. Ha (learn)__________________in Hanoi, but she (not live)______________ there. 68. My brother (not live )______________in London; he (live)___________ in Manchester. 69. Now Mr. Long (design ) ____________________his dream house. 70. He (like)_______apples, but he (not like )__________________bananas.

1 We will come home early in order to we can help you with the preparations A will come B in order to C can help D with 2 If you don't join this English club, you wouldn't have chance to practise speaking English A don't join B have C to practise D speaking 3 The new English teacher whom comes from Australia is very kind and helpful A new English B whom C from D very kind 4 I'm not sure why she left, but she mentioned to have an appointmment or something A why she left B but C to have D or something 5 It's only my first week in Paris, and i saw so many interesting things already A only B first week C saw D interesting tìm,sửa các lỗi sai và giải thích

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11. Vous (regarder) …………… la télévision. 12. J'…………… (arriver) au Canada pour 3 mois. 13. Mon frère …………… (commencer) son devoir de mathématiques. 14. Toi et moi …………… (habiter) la même maison. 15. Ils …………… (lancer) des papiers dans la poubelle pour passer le temps. 16. Ils …………… (payer) leurs achats avec une carte de crédit. 17. Lucile…………… (trouver) que le devoir est trop simple. 18. Je …………… (parler) à ma soeur mais elle ne m'écoute pas. 19. Tu …………… (tirer) sur la queue de mon chat et je n'apprécie pas. 20. Tu (jouer) …………… de la guitare ?

Làm hộ mình vs ạ . Cảm ơn các bạn nhiều