Viết rõ lời giải chi tiết giúp em nhé (ưu tiên làm phần b; phần a ko làm cũng đc nhưng làm đc thì càng tốt ạ)

a,-15/x=25/45 b,21:245=-15:(7x)

Giải thích giúp e tại sao mn lại chọn đáp án đó lun ạ

yêu cầu lm hết bài , phk có giải thik , ai ko lm đc né ra hộ ai làm sẽ đc 15 điểm + CTLHN + cảm ơn + 5 sao ạ

Giải giúp mik nha mn Cảm ơn trc ạ

Viết các phân số sau thành phân số thập phân 27/90,56/800,9/125,16/250

tại sao hơi nước là hợp chất. hứa vote và ctlhn

a,6660-9/11100-15 b,1620+12/1215+9

Mng giúp em vs ạ em đang rất gấp

31.The little boy with his friends ____________coming here. A. be B. is C. are D. to be 32.Neither the teacher nor the students ________happy about the test results. A. are B. is C. has D. have 33. A number of sheep ____________eating grass now. A. is B. are C. was D. were 34.Three weeks _______not enough holiday. A. are B. were C. was D. been 35.A number of students ____________ volunteered to the job. A. have B. has C. to have D. having 36.A large number of reporters _________ at the meeting yesterday. A. being B. were C. are D. is 37.Collecting old coins and paper notes ____ one of my hobbies. A. being B. were C. are D. is 38.Five thousand pounds _____________ stolen in the robbery last night. A. being B. were C. are D. was 39.The English ____________ to drink tea. A. likes B. to like C. like D. has liked 40.Jim as well as I ____________ always busy doing English homework. A. am B. has been C. are D. is 41.Neither Daisy nor I _____________ glad to do that. A. am B. has been C. are D. is 42.The police ___________ come to the site of the accident. A. have B. has C. having D. to have 43.Neither he nor they _______________ here yesterday. A. are B. were C. is D. be 44. Either John or his children _____________ breakfast each morning. A. make B. makes C. making D. to make 45.Both a poem and a short story ____________ been written by the young author. A. has B. to have C. have D. having