cho tam giác ABC cân tại A ( góc B = góc C = 40 độ ). Kẻ tia phân giác BD (D thuộc AC). Trên tia AB lấy điểm M sao cho AM = BC. a) chứng minh BD+AD=BC b) tính số đo góc AMC

cho A=1+3+3^2+...+3^20;B=3^21.Tính 2A-2B? giúp mình vs

kể tên 13 đời vua nhà Nguyễn, theo thứ tự từ 1 đến 13

Viết đoạn văn 5-7 câu về tác dụng của rừng đối với con người, trong đó có sử dụng 1câu rút gon

456+678-379=? danh cho bn cua hong2011 ne

mọi người làm ơn giúp mik làm bài 1 với (pls PLS PLS PLS) chỉ cần bài 1 thôi ai giúp mik sẽ cho 5 sao và cảm ơn

giới thiệu hoàn cảnh sáng tác của văn bản tô cô và vị trí đoạn trích

I. Chuyển các câu sau sang câu bị động 1. Mary types letters in the office. 2. His father will help you tomorrow. 3. Science and technology have completely changed human life. 4. Peter broke this bottle. 5. They are learning English in the room. 6. Nothing can change my mind. 7. No one had told me about it. 8. I don’t know her telephone number 9. My students will bring the children home. 10. They sent me a present last week. 11. She gave us more information. 12. The chief engineer was instructing all the workers of the plan. 13. They can’t make tea with cold water. 14. Somebody has taken some of my books away. 15. They will hold the meeting before May Day. 16. They have to repair the engine of the car. 17. The boys broke the window and took away some pictures. 18. People spend a lot of money on advertising every day. 19. Teacher is going to tell astory. 20. Mary is cutting a cake with a sharp knife. 21. The children looked at the woman with a red hat. 22. They have provided the victims with food and clothing. 23. People speak English in almost every corner of the world. 24. You mustn’t use this machine after 5:30 p.m. 25. After class, one of the students always erases the chalk board. II. Chuyển các câu hỏi dạng đảo Có/Không sang câu bị động 26. Do they teach English here? 27. Will you invite her to your wedding party? 28. Has Tom finished the work? 29. Did the teacher give some exercises? 30. Have they changed the window of the laboratory? 31. Is she going to write a poem? 32. Is she making big cakes for the party? 33. Are the police making inquires about the thief? 34. Must we finish the test before ten? 35. Will buses bring the children home? 36. Have you finished your homework? III. Chuyển các câu hỏi bắt đầu bằng từ hỏi “H/WH” sau sang câu bị động 37. Why didn’t they help him? 38. How many games has the team played? 39. Where do people speak English? 40. Who are they keeping in the kitchen? 41. How can they open this safe? 42. What books are people reading this year? 43. How did the police find the lost man? 44. Who look after the children for you? 45. How long have they waited for the doctor? 46. What time can the boys hand in their papers? 47. Who lend you this book? 48. How many marks does the teacher give you? IV. Chuyển các câu có 2 tân ngữ sau sang câu bị động 49. They paid me a lot of money to do the job. 50. The teacher gave each of us two exercise books. 51. Someone will tell him that news. 52. They have sent enough money to those poor boys. 53. They have given the women in most countries in the world the V. Chuyển các câu với động từ tường thuật sau sang câu bị động 54. They think that he has died a natural death. 55. Some people believe that 13 is an unlucky number. 56. They say that John is the brightest student in class. 57. They reported that the President had suffered a heart attack. 58. I knew that they had told him of the meeting. 59. They declared that she won the competition. 60. They rumored the man was still living. 61. People think that Jack London’s life and writing’s represent the American love of adventure. 62. They reported that the troops were coming. 63. People believed that the earth stood still.

anh/chị có đồng tình với lời khuyên: "bạn hoàn toàn có thể tự hào về những vết sẹo từ những tổn thương của mình không" ? vì sao

Tìm nghiệm nguyên của phương trình sau: $x \sqrt{121 - y ^ 2} - y \sqrt{7 - x ^ 2} = 11$