giúp mình với ạ:(((mình đng cần gấp

Giải hệ phương trình: $\left \{ {{x + 2y - xy - 2 = 0} \atop {x^{2} - y^{2} + 2x^{2}y + 2xy^{2} + 1 = 0}} \right.$

Exercise 3: Choose the best answer that best fits the meaning of the sentence or is the passage sentences of the root one. 14. The fire has caused a considerable damage. A. A considerable damage been has caused the fire. B. A considerable damage has caused the fire. C. A considerable damage has been caused by the fire. D. A considerable damage has caused by the fire. 15. John will have received the papers by tomorrow. A. The papers will have been received by tomorrow by John. B. The papers will have received John by tomorrow. C. The papers will have been received John by tomorrow. D. The papers will have received tomorrow by John. 16. They haven’t decided anything yet. A. Nothing has been decided yet. B. Anything haven’t been decided yet. C. Nothing has decided yet. D. Anything have decided yet. 17. Your hair is long. You ought to get it cut. A. Your long hair needs cutting. B. You ought to have your long hair cut. C. Your long hair should be cut. D. All are correct. 18. The medical profession borrowed the technology from the other fields. A. The technology borrowed the medical profession from the other fields. B. The technology was borrowed from the other fields by the medical profession. C. The technology were borrowed from the other fields the medical profession. D. The technology from the other fields borrowed by the medical profession. 19. The surgeons arranged for the installation of a TV screen in the operating theatre. A. The installation of a TV screen in the operating theatre arranged the surgeons. B. The installation of a TV screen in the operating theatre arranged by the surgeons. C. The installation of a TV screen in the operating theatre were arranged by the surgeons. D. The installation of a TV screen in the operating theatre was arranged by the surgeons. 20. They first drew up emergency plans, later abandoned to build new cities. A. Emergency plans was first drown up and later abandoned to build new cities. B. Emergency plans were first drown up and later abandoned to build new cities. C. Emergency plans are first drown up and later abandoned to build new cities. D. Emergency plans is first drown up and later abandoned to build new cities.

Hồn hoàn thứ 10 của Hạo Thiên Chùy màu gì ?

Exercise 3: Choose the best answer that best fits the meaning of the sentence or is the passage sentences of the root one. 7. The police are interviewing all the witnesses. A. All the witnesses are interviewing the police. B. All the witnesses are being interviewed by the police. C. All the witnesses is interviewed the police. D. All the witnesses were being interviewed by the police. 8. We’re going to give David a big surprise. A. A big surprise is going to give David B. A big surprise is going to be given to David C. David is going to give a big surprise D. David is going to be given to a big surprise 9. They have painted the walls green. A. The walls has painted green. B. The green has been painted walls C. The walls have been painted green D. The walls have painted to green 10. They will finish the work next week. A. The work will be finish next week. B. The work will be finishing next week. C. The work will finish next week. D. The work will be finished next week. 11. The delegates had received the information before the recess. A. The information had received the delegates before the recess. B. The information had been received before the recess the delegates. C. The information had been received before the recess by the delegates. D. The information had received before the recess the delegates. 12. The teacher should buy the supplies for this class. A. The supplies should buy the teacher for this class B. The supplies should buy this class for the teacher C. The supplies should be bought for this class by the teacher D. The supplies should be bought for the teacher by this class 13. Somebody will call Mr. Watson tonight. A. Mr. Watson will call somebody tonight. B. Mr. Watson will be call tonight. C. Mr. Watson tonight will call somebody. D. Mr. Watson will be called tonight.

Exercise 3: Choose the best answer that best fits the meaning of the sentence or is the passage sentences of the root one. 1. The cold weather damaged the plants. A. The plants were damaged by the cold weather. B. The plants was damaged by the cold weather. C. The plants are damaged by the cold weather. D. The plants is damaged by the cold weather. 2. They were doing the bedroom on Friday. A. The bedroom were being done on Friday. B. The bedroom is done on Friday C. The bedroom was being done on Friday D. The bedroom are done on Friday 3. They’re painting the living room now. A. The living room is painting now. B. The living room is painted now. C. The living room is being painting now. D. The living room is being painted now. 4. Martha was delivering the documents to the department. A. The documents was being delivered to the department by Martha. B. The documents was delivered to the department by Martha. C. The documents was being delivering to the department by Martha. D. The documents is being delivered to the department by Martha. 5. The mayor is going to open a new airport. A. A new airport is going to opened by the mayor. B. A new airport is going to open by the mayor C. A new airport is going to be opened by the mayor D. A new airport is going to be open by the mayor 6. If you can’t drive, who is going to drive your car? A. If you can’t drive, who is going to be driven your car? B. If you can’t drive, by whom is your car going to be driven? C. If you can’t drive, whom is your car going to be driven? D. If you can’t drive, who your car is going to drive?

em cần câu 3 vs câu 5 ạ,giúp e vs ạ

a,x mũ 2 = x mũ 5 b, 5 mũ x + 5 mũ x + 2 = 650 c, 32 mũ x .16 mũ x = 1024

tìm bài hát có lời nhắc đến 1 trong ba cây : lài, dừa, mít nhé

Trong không gian O x y z , cho điểm A ( 0 ; 1 ; 9 ) và mặt cầu ( S ) : ( x − 3 ) 2 + ( y − 4 ) 2 + ( z − 4 ) 2 = 25. Gọi ( C ) là giao tuyến của ( S ) và mặt phẳng ( O x y ) . Lấy hai điểm M, N trên ( C ) sao cho M N = 2 √ 5 . Khi tứ diện OAMN có thể tích lớn nhất thì đường thẳng MN đi qua điểm nào dưới đây?