A+2=2B A(B+D)=A x 6 : 1/4 - 13 B+D+A=F D x A =(D+1)x A-6 D+C=A+E+8 hỏi A B C D E F bằng bao nhiêu??

nhân dân ta có câu tục ngữ ''gần mực thì đen gần đèn thì sáng''giải thchs câu tục ngữ trên lập dàn ý

vì sao những học sinh học nội trú hay bị lang ben? giải giúp mk với ạ. Mai mk thi rồi

tìm diện tích một hình vuông biết nếu tăng cạnh của nó thêm 20% thì diện tích tăng 142.56 cm2. diện tích hình vuông là....

2n:[1+(1\1+2)+(1\1+2+3)+...+(1\1+2+3+4)+...+(1+1+2+3+4+...+n)]=2020 tìm n

2,28 lít hỗn hợp khí B gồm O2 và O3 biết khối lượng mol trung bình hỗn hợp khí B = 40 tính phần trăm thế tích khí trong B

Các bạn làm cho mik bài thơ 4 và 5 chữ nha, ko chép mạng.

1. They spent a lot of money on food and clothes. A. A lot of money on food were spent B. A lot of money was spent on food and clothes C. A lot of money were spent on food and clothes D. Money was spent a lot on food and clothes 2. The restaurant serves seafood every Monday. A.Seafood is served every Monday. B.Seafood was served every Monday. C.Seafood are served every Monday. D.Seafood were served every Monday. 3. Mary informed the police of the news A.The police was informed of the news by Mary. B.The news was informed of the police. C.The police were informed of the news. D.The police of the news was informed by Mary. 4. The ambulance is taking the boy to hospital. A. To the hospital is the boy being taken. B. The boy is being taking to hospital. C. The boy is being taken to hospital. D. The boy is taken to hospital. 5.The engineers will construct a bridge over this house. A. This house will be constructed over a bridge. B. A bridge will be constructed over this house. C. This house will be being constructed over a bridge. D. A bridge will be being constructed over this house. 6. Someone has stolen his gun. A. His gun has been stolen. B. His gun has stolen. C. He has been stolen the gun. D. The gun has been stolen him. 7. We have to tell Mary about our change in plans. A. Mary has to be told about our change in plans. B. Our change in plans should be told for Mary. C. Mary is told about our change in plans. D. Our change in plans is told to Mary. 8. We thought you were serious when you said you were leaving . You were thought _________ when you said you were leaving. A. to have been serious B. to being serious C. to be serious D. to have been seriously 9. The directors have fired those lazy clerks A Those lazy clerks have been fired. B Those lazy clerks has been fired. C Those lazy clerks had been fired. D Those lazy clerks were fired . 10. They didn’t explain anything about that . A.Nothing was explained about that . B.That wasn’t explained anything by them . C.Anything wasn’t explained about that . D.Something wasn’t explained about that . 11.They showed his photograph on television. A. On television they have his photograph shown. B. His photograph was shown on television. C. His photograph is being shown on television. D. The television was shown his photograph. 12. We must find this killer. A. This killer we must find. B. This killer is found. C. This killer be found. D. This killer must be found. 13. They signed the contract at lunchtime. A.They were signed the contract at lunchtime. B.At lunchtime the contract were signed C.The contract at lunchtime was signed . D.The contract was signed at lunchtime. 14. Someone ought to do something about it. A. Something about it ought to be done. B. Someone ought to be done about it. C. Something ought to be done about it. D. It ought to be done something by someone. 15. People should send their complaints to the head office. A. Their complaints were sent to the head office. B. The head office was sent their complaints. C. Their complaints should be sent to the head office. D. The head office should be sent complaints.

giúp mk với ạ Mà ai có đề thi hsg văn t.ph Bắc Giang ko ạ, cho mk xin

Quá trình thu nhận kích thích của sóng âm diễn ra như thế nào?