Tìm điều kiện của tử và mẫu để các số hữu tỉ sau thỏa mãn (2-20 chẵn)

Cho mik hỏi bài này làm sao v ạ ? Thanks mn nhé ^^

Cho 2 tập hợp A= { 5k+7| k€Z} và cho B = { 10l+22|l€ Z} Chứng minh B là con của A

Làm giúp mình phần bài đọc với ạ

Giúp em với ạ em cảm ơn bài 4 ạ

Giải giúp mình bài 2 và 3 nữa ạ

help me 26. Peter has been trying for an hour, but his car still _________ start. a. won’t b. wouldn’t c. didn’t d. hasn’t 27. It’s an hour since he _____________, so he must be at the office now. a. is leaving b. was leaving c. has left d. left 28. Most students __________ hard for the last few weeks. a. were working b. worked c. are working d. have been working 29. The girl weeps whenever she _____________ such a story. a. hears b. has heard c. will hear d. heard 30. As soon as we ___________ this new apartment, we __________. a. are finding/will move b. found/moved c. would find/move d. find/would move 31. My teacher arrived after we ____________ for him for ten minutes. a. was waiting b. have waited c. had waited d. waited 32. This is the first time I __________ to play badminton. a. have tried b. am trying c. was trying d. would be trying 33. Jack accepted ____________ for his brother’s fault. a. to punish b. to be punished c. punish d. being punished 34. Gold _______ in California in the 19th century. a. was discovered b. has been discovered c. was discover d. they discovered

Ủy ban yêu cầu một thay đổi về những mục tiêu. tiếng Anh là j

Mọi người giúp em với. Em cảm ơn

help me 17. The Browns ___________ here since 1990. a. are living b. has lived c. have been living d. has been living 18. The majority of the TOEFL tests ________ difficult. a. are b. is c. be d. has been 19. Local news ___________ on TV every afternoon at 6:30pm. a. were b. was c. is d. are 20. A pair of binoculars __________ necessary for your trip. a. is b. are c. be d. being 21. She came into the room while they _____________ television. a. watched b. have watched c. are watching d. were watching 22. I ___________ a headache since yesterday. a. had b. was having c. have had d. would have 23. The teacher ___________ into the room. a. has still come b. has already come c. has yet come d. has recently come 24. When he failed to meet us, we __________ without him. a. left b. would leave c. was leaving d. has left 25. He ____________ book the tickets, but he had no time to call at the cinema. a. would b. will c. is going to d. was going to