giúp em giải với ạ em cảm ơn nhiều ạ

giải ptr 1 : cos2x - sin2x = 0 2 : 2cos^2x + 5sinx - 4 = 0 3 : 5sinx(sinx-1)-cos^2x=3

Mọi ngừoi giúp em Vd1 và Vd3 với

một bể nước dạng hình hộp chữ nhật có các kích thước lòng bể là 1.8m ; 1.5m và 1.2m .Trong bể đang chứa nước chiếm 75% thể tích lòng bể. Hỏi trong bể đang có bao nhiêu lít nước ( mọi người giúp em voi )

41. ____________because it is harmful for environment! A. Not litter B. Litter C. Do litter D. Don’t litter 42. He might __________ on the Moon in the future. A. lives B. live C. to live D. living 43. Don’t phone Ann now. She _____________be having lunch. A. might B. can C. must D. has to 44. I_____________ to Singapore three times. A. have gone B. have been C.went D. visited 45. My brother can’t swim_____________he’s afraid of water . A. because B. but C. and D. so 46. There aren’t _____________ good films on TV at the moment. A. some B. any C. much D. a lot 47. “__________ do you go camping?” –“Rarely” A. When B. Where C. How D. How often 48. Which subject is __________, mathematics and English? A. more difficult B. difficulter C. difficult D. the most difficult 49. I never meet __________ interesting people nowadays. A. some B. any C. a D. the 50. She’s small __________ beautiful. A. and B. but C. so D. also 51. __________ do you usually go out with? A. Who B. What C. When D. Where 52. Sarah is__________ than Marta. A. more friends B. friendly C. friendlier D. more friendly 53. Many people think that Venice is__________ city in the world. A. the beautiful B. more beautiful C. very beautiful D. the most beautiful 54. “Does July often take the bus?”—“Yes, __________” A. she always does B. she rarely does C. she never does D. she ever does 55. __________ visit her family? A. John sometimes B. Is John sometimes visiting C. Does John sometimes D. Sometimes John 56. In the future, we ________ go on holiday to the Moon or other planets. A. could B. must C. might D. should 57. Robots make car manufacturing ________ because they can take on dangerous jobs in place of humans. A. stronger B. safer C. larger D. heavier 58. ________ robots can help to teach children in the classroom, they will never replace teachers. A. When B. Although C. Because D. If 59. ________ robots be able to feel and behave like us? A. Will B.Can C. Do D. Are 60. _______ robots take our jobs, what will humans do all day? A. When B. Whether C. If D. Although 61. It was so noisy that we _______ hear ourselves speak. A. can B. mustn’t C. could D. couldn’t 62. _____the newsreaders on BBC reads very fast, my brother can hear everything in the news. A. But B. Although C. When D. Because 63. Have you ever _________ to Singapore? A. be B. been C. went D. go 64. Japan is one of ______________countries in the world. It costs you a lot of money to live there. A. the most expensive C. the more expensive B. most expensive D. more expensive 65. Will robots be able ______________ our voices? A. to recognize B. recognizing C. recognized D. recognizes 66. My uncle ______________ a new apartment for a month. A. bought B. has bought C. buys D. will buy 67. I’ll get the news tomorrow, so I ______________ phone and tell you. A. won’t B. will be C. will D. can’t 68. We can watch TV programmes from other countries by ______________ wireless TV. A. use B. to use C. using D. used 69. “_____________?” “Every day” A. What kind of junk food do you eat B. Who eat junk food C. How often do you eat junk food D. Why do you eat junk food 70. “I don’t have to work today”. – “… ” A. Why don’t we to go out somewhere? B. Let’s going out somewhere. C. What about go out anywhere? D. How about going out somewhere? 71. “Which sport do you like best?” –“ ” A. I think soccer is very exciting B. I don’t enjoy playing table tennis C. Skiing is very dangerous D. I never play tennis 72. Andrew is taller than Martin. A. Andrew is very tall. B. Martin isn’t as tall as Andrew. C. Martin is a little shorter than Andrew. D. b & c are correct. 73. My family enjoys watching game shows ______ they are very exciting and interesting. A. so B. because C. but D. and 74. My sister enjoys ____________ table tennis in her free time. A. playing B. play C. to play D. to playing 75. Japan is one of __________ countries in the world. It costs you a lot of money to live there. A. the most expensive C. the more expensive B. most expensive D. more expensive 76. ___________ draw on the walls and tables, please. A. Do B. Don’t C. Should D. Shouldn’t 77. I_____________ to Singapore three times. A. have gone B. have been C.went D.visited 78. There aren’t _______________ good films on TV at the moment. A. some B. any C. much D. a lot 79. They have been in love with each other ____________ they were young. A. while B. until C. for D. since 80. The Nile River is the ____________ river in the world. A. high B. longest C. longer D. highest

a.(3 √ 18+2 √50-4 √72).8 √ 2 b.(-4 √ 20+5 √500-3 √45): 8 √ 2

Đặt câu với từ hữu nghị Đặt câu với xanh tươi

1 , where did you get the information about Disneyland Resort ? ( find ) -) 2 , what time did you get out of bed this morning ? ( up ) -) 3, I’ ll read this leaflet to see what activities are organized at this attraction . ( look ) -) 4, They’re going to publish a guidebook to different beauty spots in Viet Nam. ( out ) -) 5 , I’m thinking with pleasure about the weekend! (forward) -)

a+a+a+a+a nếu a =4 thì viết tích = hai cách

1. We _____________live in the city in the future. A. will B. won’t C. don’t D. doesn’t 2. He will_____________some pictures with his camera. A. takes B. taking C. take D. took 3. If we plant more trees, the air _____________be so polluted. A. will B. won’t C. do D. did 4. If he _____________so hungry, he will eat that cake. A. is B. are C. be D. was 5_____________ the film is late, I will wait to watch it. A. Because B. When C. But D. Although 6. My father first _____________ Da Lat in 2010. A. go B. went C. visited D. been 7. If the weather _____________ good, I _____________camping with classmates. A. is / go B. is / will go C. will be / go D. will be / will go 8. Walking to school will help ……………… air pollution. A. reduce B. reuse C. recycle D. refill 9. My sister _____________ home for school yet. A. didn’t leave B. don’t leave C. hasn’t left D. isn’t leaving 10. Amsterdam is one of the _____________ cities in the world. A. peacefulest B. peacefuler C. most peaceful D. more peaceful 11. ____________, you will succeed. A. Work hard B. Working hard C. If you work hard D. If only you work hard 12. He likes playing table tennis, ______________he can’t play it. A. and B. but C. so D. or 13. . ______________walk in the rain. It’s not good for your health. A. Won’t B. Can’t C. Don’t D. Mustn’t 14. In the future, we won’t go on holiday to the beach but we ________ go on holiday to the moon. A. must B. can’t C. might D. won’t 15. _______the air is cleaner; people will have less breathing problems. A. Unless B. When C. Because D. If 16. They couldn’t go on a picnic ______________the weather was bad. A. because B. when C. but D. or 17. My house is ______________to the supermarket. A. to the left B. behind C. near D. next 18. We ___________to Ho Chi Minh City for our last summer vacation. A. go B. went C. goed D. will go 19. ___________Liz buy a lot of souvenirs for her friends? A. Did B. Do C. Were D. Is 20. John ___________return to America last week. A. doesn't B. isn't C. didn't D. wasn't 21. Last weekend Phong and Lan ___________their grandparents. A. visited B. was C. did D. are 22. All of us ___________at home yesterday evening. A. were B. was C. did D. are 23. I have a lot of homework, _________ I can't go out with you. A. because B. and C. but D. so 24. _________ Tom and Jerry is rather funny, she doesn't like watching that film. A. and B. but C. because D. although 25. ___________ hours a day do you watch television? A. How many B. How much C. When D. How often 26. ___________ is her favorite telecision MC? A. When B. Who C. What D. Where 27. ___________ do you go to Hanoi? – By car. A. How many B. How much C. How D. How often 28. I want to watch the cartoon _________ it is funny and simple. A. but B. so C. although D. because 29. They ______ badminton next week. A. will play B. to play C. playing D. plays 30. Duyen ______ with us to the museum next weekend. A. won’t go B. dosen’t will go C. won’t goes D. not will go 31. “______will clean the classroom tomorrow ?” – “ Tu and Manh”. A. What B. Who C. When D. Where 32. I ______a birthday party on Tuesday, November, 10th. A. will having B. having C. am having D. be having 33. We will ______our old friends next Sunday. A. meet B. to meet C. meeting D. will meet 34. ______is your telephone number? A. what B. when C. which D. how 35. ______you have a test tomorrow morning? A. will B. do C. are D.is 36. Will he be free? - ______ A. No, he isn't B. No, he doesn't C. No, he won't D. No, he be not 37. she will ______ happy. A. be B. is C. are D. am 38. My family often______ for picnic on the weekend. A. goes B. go C. are going D. is going 39. The children______ camping next week. A. will go B. is going C. go D. goes 40. If we use __________ paper, we will save a lot of trees. A. Fewer B. Less C. More D. Much