user-avatar
ldp2019
2 năm trước
Câu 1: Giả sử x,y,z là các số thực thỏa mãn điều kiện x+y+z=3. Tìm min của M= x^4+y^4+z^4+12(1-x)(1-y)(1-z) Câu 2: Tìm số nguyên dương x,y sao cho: x^3+y^3+4(x^2+y^2)+4(x+y)=16xy Các bạn giúp mình với an, các bạn giúp dc bài mình cũng cảm ơn rất nhiều ạ
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

BÀI TẬP VỀ THÌ EXERCISES ON TENSES Exercise 2: Circle a, b, c or d before the best option to complete the sentence: 1. I will see him when he...... here tomorrow. a. comes b. will come c. has come d. had come 2. The boys broke a window when they ... football. a played b. were playing c. have played d. are playing 3. What ................... to you yesterday? A. happened b. did happen c. had happen d. was happening 4. It was the most exciting film I.......................... . a. never saw b. ever saw c. had ever seen d. have ever seen 5. He said that he ............................ his work since 7 o’clock. a. did b. has done c. had done d. would do 6. I......................... about him when suddenly he came in. a. talk b. talked c. am talking d. was talking 7. Please don’t touch anything before ........................ . a. the police will come b. the police comes c. the police come d. the police would come 8. “When...............................................?” - In 1928 a. penicillin was discovered b. was penicillin discovered c. did penicillin discovered d. did penicillin discover 9. They have been in love with each other................. they were young a. while b. until c. for d. since 10. Do you know what ......................... there yesterday? a. she is doing b. was doing c. did she do d. she did 11. At present, that author .................. a historical novel. a. is writing b. was writing c. has written d. had written 12. By next month, I......................my first novel. a. will finish b. am going to finish c. finish d. will have finished 13. I....................... the money from him yet. a. haven’t received b. don’t receive c. will receive d. am receiving 14. Don’t make noise. My mother ............................ with her friend. a. is talking b. was talking c. talks d. talked 15. .................... the teacher gave me a passing grade. a. After taking the test b. After I take the test c. After I took the test d. After I had taken the test 16. No sooner.............................the office than the phone rang a. was he leaving b. he was leaving c. he had left d. had he left 17. How many times .................... there so far? A few times. a. have you been b. would you be c. were you d. had you been 18. It’s at least a month since ........................ Tom. a. I last seen b. I last see c. I have last seen d. I last saw 19. Up to then, I.......................... such a big fire. a. have never seen b. had never seen c. never seen d. never see 20. I.............................. her since I........................ a student. a. know/ am b. knew/ was c. have known/ am d. have known/ was 21. They.........for 3 hours when the storm suddenly broke. a. had been running b. have been running c. are running d. will be running 22. I assumed you ........paying for the repairs until the end of last year. a. have been b. was been c. are being d. had been 23. ...........get tired of answering the same questions every day? a. Have you ever b. Had you ever c. Do you ever d. Are you ever 24. She .......working on that manuscript for 2 year now. a. will be b. has been c. had been d. is 25. I.........there once a long time ago and .......back since. a. went/have not been b. go/am not c. have gone/was d. was going/had not been 26. She...........trying to pass her driving test but fails every time. a. kept b. is keeping c. did want d. keeps 27. I.........complete silence now while I try this experiment. a. am wanting b. want c. had wanted d. have wanted 28. The students.........by Mrs. Monty. However, this week they .....by Mr. Tanzer. a. are usually taught/are being taught b. usually teach/are teaching c. have usually been taught/have been teaching d. were usually teaching /are teaching 29. No matter what happens next I.......help you. a. am b. have c. will d. would 30. In the last hundred years, traveling.......much easier and more comfortable. a. becomes b. has become c. became d. will become

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team