√a ²+2 √a ²-1 - √a ²-2 √a ² -1 với a=√5

11. He said that everything ________ all right A. is B. would be C. will be D. can be 12. Each of you ________ a share in the work A. have B. having C. has D. going to have 13. How many times________ them so far? A. have you seen B. did you see C. were you seeing D. had you seen 14. Please send our regards to Tom as soon as you ________ in New York. A. will arrive B. is going to arrive C. arrive D. arrived 15. By the time the ambulance approached, the man________. A. would die B. had died C. died D. dies 16. We________ for going home when it began to rain A. has prepared B. are preparing C. will be preparing D. were preparing 17. I haven’t seen him for months. A. It’s months since I last saw him B. It’s months when I last saw him C. It’s months before I last saw him D. It’s months after I last saw him 18. Tim________ his hair while I ________ up the kitchen A. washed-was cleaned B. was washing-was cleaning C. was washing-cleaned D. washed-cleaned 19. Working for 12 hours a day ________ her very tired. A. makes B. made C. make D. making 20. I am so happy to hear from Mary because I haven’t seen her ________ last year. A. for B. on C. since D. later

chứng minh rằng với mọi n chẵn A=n^3-76n chia hết cho 48

Vẽ bé đậu mầm cute Nl: vui vì nhận đc quà từ hoidap

Pt đa thức thành nhân tử (x+2)(x+3)(x+4)(x+5)-24

Tính các góc của ΔABC biết 4 ∠A ; 6 ∠B; 3 ∠C tính góc A góc B góc C Giair thích giùm cho ạ. Cảm ơn trươc nha :3

Pt đa thức thành nhân tử (x+2)(x+3)(x+4)(x+5)-24

Giúp mình với hôm nay mình phải nộp rồi

Anh chị có đồng tình với quan điểm của tác giả trong 2 dòng thơ in "anh không thể chỉ đấm say đứng nhìn Anh phải là một nét vẽ dẫu đơn sơ "

Exercise 1: Hãy chọn một đáp án đúng nhất (A, B, C hoặc D) cho mỗi câu sau: 1. He has lived here since he ________ here. A. came B. has came C. comes D. come 2. John________ as a journalist since he ________ from university in 2000. A. is working / graduate B. worked / graduated C. had worked / will be graduate D. has been working / graduated 3. He does not save as much money as he________ last year. A. did B. does C. uses D. did used 4. She has not written to me________ we met last time. A. before B. since C. ago D. meanwhile 5. The police ________ for the thieves at the moment. A. have been looking B. will be looking C. are looking D. is looking 6. Put the raincoat on. It________. A. had rained B. will be raining C. is raining D. has rained 7. Since motion pictures________ we have had a new kind of entertainment. A. were invented B. have been invented C. will have been invented D. had been invented 8. There________ a lot of furniture in our uncle's house now. A. is being B. were C. are D. is 9. Mr. Jones sometimes________ on time for work. A. does not get up B. won't get up C. had not got up D. is not going to get up 10. He ________ for twenty years before he retired last year A. had been teaching B. has taught C. was teaching D. has been teaching 11. He said that everything ________ all right A. is B. would be C. will be D. can be 12. Each of you ________ a share in the work A. have B. having C. has D. going to have 13. How many times________ them so far? A. have you seen B. did you see C. were you seeing D. had you seen 14. Please send our regards to Tom as soon as you ________ in New York. A. will arrive B. is going to arrive C. arrive D. arrived 15. By the time the ambulance approached, the man________. A. would die B. had died C. died D. dies 16. We________ for going home when it began to rain A. has prepared B. are preparing C. will be preparing D. were preparing 17. I haven’t seen him for months. A. It’s months since I last saw him B. It’s months when I last saw him C. It’s months before I last saw him D. It’s months after I last saw him 18. Tim________ his hair while I ________ up the kitchen A. washed-was cleaned B. was washing-was cleaning C. was washing-cleaned D. washed-cleaned 19. Working for 12 hours a day ________ her very tired. A. makes B. made C. make D. making 20. I am so happy to hear from Mary because I haven’t seen her ________ last year. A. for B. on C. since D. later