chứng tỏ rằng 3.n/3.n+1 là phân số tối giản

Giúp mình mấy câu lí thuyết về động lượng và công với ạ

20. My daughter said that there _______ a few stray passers - by and locals. * A. is B. were C. are D. was 7. Red wondered why his girlfriend ___________ such badly the previous day. * A. had behaved B. have behaved C. behaved D. is going to behave 18. A neighbor told me that she ________ a bag while her husband _________ to hold her hands. * A. was dragging - was trying B. has been dragging - has been trying C. is dragging - is trying D. had been dragging- had been trying 22. My mother told me ______to attend my make up class. * A. not to remember B. remember C. not to forget D. to forget 5. Max told me he ____________ those letter to his parents. * A. has just sent B. has sent just C. had just sent D. had sent just 19. "Listen carefully", he said to us. * A. He told us listen carefully. B. He told to us to listen carefully. C. He told us to listen carefully. D. He said us to listen carefully. 16. I told Jim __________ whenever she felts angry. * A. to not shout B. not shout C. not to shout D. not shout to 13. Charlie told her that he had seen Jack at a party a few months _________. * A. after B. before C. ago D. the previous ago 11. Scott said, "You can come and stay with me if you are ever in London". * A. Scott said you could come and stay with him if you were ever in London. B. Scott said I could come and stay with him if I were ever in London. C. Scott said you can come and stay with him if you are ever in London. D. Scott said I can come and stay with him if I am ever in London. 3. Kate said Nora and Jim were getting married _________. * A. next month B. the next month C. the month before D. the previous month 8. Beth said she ____ finish her homework and then she was allowed to hang out with friends. * A. must B. can C. shall D. had to 14. Tom wanted to know _________ she was okay. * A. whether B. if C. what D. A & B are correct 12. Jay said, "Tom had an accident last week but he wasn't injured". * A. Jay said Tom had an accident last week but he wasn't injured. B. Jay said Tom had had an accident last week but he wasn't injured. C. Jay said Tom had had an accident the previous week but he hadn't been injured. D. Jay said Tom had an accident last week but he hadn't been injured. 23. She asked me ________ I was. * A. how old B. how much C. how many D. how far 21. The office worker told his director he could download _________ applications for free on his phone. * A. this B. that C. these D. those 4. Rosy ___________ if she could sit there. * A. said B. told C. asked D. wanted to know 15. "Stay in bed for a few days", the doctor said to me. * A. The doctor told me stay in bed for a few a days. B. The doctor told to me to stay in bed for a few days. C. The doctor said me to stay in bed for a few days. D. The doctor told me to stay in bed for a few days. 6. Charlie said to her siblings that Margaret ________ a baby. * A. has had B. have had C. had D. had had 24. The veterinarian said that I should ______ the coop the following day. * A. cleaned up B. clean up C. cleans up D. will clean up 25. The teacher told students microphone and headphone ___________ must - have items. * A. are B. is C. were D. was 1. Charlie said he was going to live in Canada _________. * A. next week B. last week C. the week before D. the next week 17. Ann told her sister __________ anyone what happened * A. not to tell B. to tell C. to not tell D. not tell 2. Jack said his father _______ in a garden then. * A. was gardening B. are gardening C. will garden D. garden 9. Alex said, '"I work 14 hours a day". * A. Alex said that he works 14 hours a day. B. Alex said that he worked 14 hours a day. C. Alex said that I work 14 hours a day. D. Alex said that I worked 14 hours a day. 10. Charlie said, "I'll tell Jim I saw you" * A. Charlie said he'll tell Jim he saw me. B. Charlie said I would tell Jim I had seen you. C. Charlie said he would tell Jim he had seen me. D. Charlie said I would tell Jim he had seen me.

15."Stay in bed for a few days", the doctor said to me. A. The doctor told me stay in bed for a few a days. B. The doctor told to me to stay in bed for a few days. C. The doctor said me to stay in bed for a few days. D. The doctor told me to stay in bed for a few days. 12. Jay said, "Tom had an accident last week but he wasn't injured". * A. Jay said Tom had an accident last week but he wasn't injured. B. Jay said Tom had had an accident last week but he wasn't injured. C. Jay said Tom had had an accident the previous week but he hadn't been injured. D. Jay said Tom had an accident last week but he hadn't been injured. 2. Jack said his father _______ in a garden then. * A. was gardening B. are gardening C. will garden D. garden 9. Alex said, '"I work 14 hours a day". * A. Alex said that he works 14 hours a day. B. Alex said that he worked 14 hours a day. C. Alex said that I work 14 hours a day. D. Alex said that I worked 14 hours a day. 7. Red wondered why his girlfriend ___________ such badly the previous day. * A. had behaved B. have behaved C. behaved D. is going to behave 1. Charlie said he was going to live in Canada _________. * A. next week B. last week C. the week before D. the next week 21. The office worker told his director he could download _________ applications for free on his phone. * A. this B. that C. these D. those 16. I told Jim __________ whenever she felts angry. * A. to not shout B. not shout C. not to shout D. not shout to 8. Beth said she ____ finish her homework and then she was allowed to hang out with friends. * A. must B. can C. shall D. had to 4. Rosy ___________ if she could sit there. * A. said B. told C. asked D. wanted to know 18. A neighbor told me that she ________ a bag while her husband _________ to hold her hands. * A. was dragging - was trying B. has been dragging - has been trying C. is dragging - is trying D. had been dragging- had been trying 19. "Listen carefully", he said to us. * A. He told us listen carefully. B. He told to us to listen carefully. C. He told us to listen carefully. D. He said us to listen carefully. 6. Charlie said to her siblings that Margaret ________ a baby. * A. has had B. have had C. had D. had had 25. The teacher told students microphone and headphone ___________ must - have items. * A. are B. is C. were D. was 10. Charlie said, "I'll tell Jim I saw you" * A. Charlie said he'll tell Jim he saw me. B. Charlie said I would tell Jim I had seen you. C. Charlie said he would tell Jim he had seen me. D. Charlie said I would tell Jim he had seen me.

Kiểu dữ liệu của biến đếm trong lệnh lặp for..do ? A. Chỉ cần khác kiểu với giá trị đầu B. Cùng kiểu với các biến trong câu lệnh C. Không cần phải xác định kiểu dữ liệu D. Cùng kiểu với giá trị đầu và giá trị cuối Giúp mình với. Hứa vote 5 sao

'Lớp trẻ Việt Nam cần nhận ra những cái mạnh, cái yếu của con người Việt Nam để rèn những thói quen tốt khi bước vào nền kinh tế mới ' Em hãy trình bày điểm mạnh. điểm yếu của con người Việt Nam mà văn bản trong sách giáo khoa đã nêu. Em hãy tìm dẫn chứng trong thực tế xã hội và phân tích dẫn chứng để làm rõ một điểm mạnh và một điểm yếu mà em quan tâm nhất

Giúp mình giải câu 11 với ạ , mình cảm ơn nhiều

Mỗi chai sữa có 0,75l sữa, mỗi lít cân nặng 1,08kg, mỗi vỏ cân nặng 0,3kg. Hỏi 100 chai sữa cân nặng bao nhiêu kg? Tìm 0,75l sữa cân nặng bao nhiêu? Tìm cân nặng của 1 chai sữa? Tìm cân nặng của 100 chai sữa

Mọi người giúp mình với ạ Câu 3 vs 4 ạ

Đốt cháy hoàn toàn một thanh nhôm trong không khí. Sau phản ứng thu được 20,4 gam nhôm oxit a. Tính khối lượng của thanh nhôm biết rằng trong thanh nhôm chứa 5 tạp chắt không cháy. b. Tính thể tích không khí ở DKTC cần dùng biết rằng oxi chiếm 1/5 thể tích không khí.