Giải mình câu này chi tiết nhất có thể

Cho phương trình x^2 - 2(m - 1) - 4m - 4 = 0 a) Chứng minh rằng phương trình luôn có hai nghiệm phân biệt x1, x2 với mọi giá trị của m. b) Tìm m để |x1 - x2| đạt giá trị nhỏ nhất. Mn làm câu b thôi nha. Mình cảm ơn !

A. Choose the right word or phrase best completes the sentence: 1. Three weeks _______not enough holiday. ​A. are​​B. were​​C. was​​​D. been 2. Each of you ____ a share in the work. ​A. having ​B. has ​​​C. to have​​ D. have 3. A number of students ____ volunteered to the job. ​A. have ​​B. has ​​​C. to have ​​D. having 4. Linguistics ____ out the ways in which languages work. ​A. find ​​B. finding ​​C. to find ​​D. finds 5. The Philippines ____ of more than 7,000 islands. ​A. consist ​B. consisting ​​C. consisted ​​D. consists 6. The United Nations ____ its head quarters in NewYork city. ​A. have ​​B. having ​​C. has​​ ​D. to have 7. One of my neighbours ____ curious about other people’s private life. ​A. being ​​B. were ​​C. is ​​​D. been 8. Tom doesn’t agree but the rest of us ____. ​A. does ​​B. done ​​C. do ​​​D. doing 9. There ____ a few flowers in this garden last summer. ​A. being ​​B. were ​​C. are ​​​D. is 10. A large number of reporters ____ at the meeting yesterday. ​A. being ​​B. were ​​C. are ​​​D. is 11. Much progress ____ been made in recent years. ​A. have ​​B. has ​​​C. having ​​D. to have 12. Collecting old coins and paper notes ____ one of my hobbies. ​A. being ​​B. were ​​C. are ​​​D. is 13. The number of pupils getting poor marks since the beginning of the semester ____ appalling. ​A. to be ​​B. have been ​​C. are​​ ​D. is 14. Five thousand pounds ____ stolen in the robbery last night. ​A. being ​​B. were ​​C. are ​​​D. was 15. Mr. Thomson with his wife and his three children ____ abroad. ​A. to be ​​B. have been ​​C. are ​​​D. is 16. One of the girls who ____ working in this department ____ my niece. ​A. is/being ​B. are/is ​​C. is/are ​​D. was/were 17. The English ____ to drink tea. ​A. likes ​​B. to like ​​C. like ​​D. has liked 18. Everybody ____ trying to do their best at present. ​A. to be ​​B. have been ​​C. are ​​​D. is 19. Jim as well as I ____ always busy doing English homework. ​A. am ​​B. has been ​​C. are​​ ​D. is 20. Neither Daisy nor I ____ glad to do that. ​A. am ​​B. has been ​​C. are ​​​D. is 21. That you take a computer course ____ very necessary. ​A. am ​​B. have been ​​C. are ​​​D. is 22. The police ____ come to the site of the accident. ​A. have ​​B. has ​​​C. having ​​D. to have 23. The pilot along with his passengers ____ rescued last night. ​A. am ​​B. have been​ ​C. was ​​D. is 24. What we need most ____ books. ​A. is ​​B. were ​​C. are ​​​D. to be 25. My brother together with his friends often ____ in the park. ​A. jogs ​​B. jogging ​​C. jog ​​​D. to jog 26. Neither he nor they ____ here yesterday. ​A. are ​​B. were ​​C. is ​​​D. be 27. Either John or his children ____ breakfast each morning. ​A. make ​​B. makes ​​C. making ​​D. to make 28. I don’t like the hot weather. Thirty degrees ____ too warm for me. ​A. was ​​B. are ​​​C. being ​​D. is 29. Not only a dog but also two cats ____ at home in his garage. ​A. was ​​B. are ​​​C. been ​​D. is 30. Both a poem and a short story ____ been written by the young author. ​A. has ​​B. to have ​​C. have ​​D. having Làm + giải thích giúp mik Vẫn còn sớm đừng ngủ vội giúp mik nhé (• ε •)(• ε •)(• ε •)

giúp e vs ạ thanks nhiều ạ giải chi tiết nha

Cho đoạn thẳng AB dài 12 cm, lấy điểm C nằm giữa A và B sao cho BC = 6 cm. a) Tính độ dài đoạn thẳng AC b) Điểm C có là trung điểm của đoạn thẳng AB không? Vì sao? c) Lấy điểm M nằm giữa A và B ( điểm M khác điểm C ). Gọi E và F lần lượt là trung điểm của AM và BM. Tính độ dài đoạn thẳng EF

40. Mother: Your face is dirty. Child: All right, I _______ ( wash) it. 41. I’ve hired a type writer and I ________ (learn) to type. 42. I________ (work) for Mr. Pitt next week as his own secretary will be away. 43. Do you think that you ______________(pass) your exams in June. 44. At this time tomorrow we ______ (fly) over the Atlantic. 45. By the time I go to bed tonight, I____________( finish) my work for the day. 46. A: I don’t feel well enough to go to the station to meet him. B: I ____________(meet) him for you. But how _________(recognize) him? A: He’s small and fair, and he ________ (wear) a black and white school cap. 47. He ____________ (live) in this city for exactly two years by next Monday. 48. I’m turning this cupboard into a darkroom. I_______ (develop) my own films. 49. “ If you don’t pay the ransom, we’ll kill your boy” the kidnappers told us. à The kidnappers threatened _________________________________________. 50. She promised to come round and see me everyday. à She said, “ I will _________________________________________________.” Các bạn giúp mik làm với Làm xong mik cần lời giải thích từ các bạn 😭😭😭

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