tim tich cua so le lon nhat co chu so , biet tong cac chu so la32 voi so lien truoc so chan lon nhat co 1 chu so may minh ko co dau mong cac ban dung bao cao vi pham nha

nhờ các bác giải giùm cái, giải bài 1 thôi

Trả lời giúp em với ạ Em cần gấp ạ

Hai thành phố A và B cách nhau 250 km. Một xe ô tô đi từ A và một ô tô đi từ B và đi ngược chiều nhau,. Hai xe đi mất 2,5 giờ thì gặp nhau . Tính a) Tổng vận tốc hai xe ( Tính tổng vận tốc theo cách thứ hai = S : t) b) Tính vận tốc của mỗi xe biết vận tốc của xe máy = 2/3 vận tốc ô tô? (hướng dẫn phần b : đưa về toán tổng tỉ để tìm vận tốc từng xe . Tổng vận tốc tìm được phần a – tỉ số là 2/3 )

AB là thanh đồng chất 2kg,dài 100cm . mỗi ròng rọc nặng 0,5 kg .Đầu A gắn với một bản lề .MA bằng 10 kg ,và AC dài 15cm .tínhmB để hệ thống cân bằng Ccá bạn ơi giuaps mình với mình cần rất gấp . ihf cảm ơn

21.She can’t come to the phone now because she ..................... tomorrow’s test. A. studies B. is studying C. has studied D. has been studying 22.They must be at the sports ground now. They usually ..................... basketball on Fridays. A. play B. are playing C. have played D. have been playing 23.I ..................... my work already. I’m ready to go for a walk with you. A. finish B. am finishing C. have finished D. have been finishing 24.I ..................... breakfast right now. Can you call a title later? A. cook B. am cooking C. have cooked D. have been cooking 25.I ..................... this book. Can I borrow it tor a week or so? A. don’t read B. am not reading C. haven’t read D. haven’t been reading 26.Maria is good at languages. She ..................... French, Spanish and German. A. speaks B. is speaking C. has spoken D. has been speaking 27.So far, he ..................... five stories for children. A. writes B. is writing C. has written D. has writing 28.We ..................... for their answer for two months already A. wait B. are waiting C. have been waited D. have been waiting 29.She ..................... since Monday. A. is sick B. is being sick C. has been sick D. has been being sick 30.She ..................... since noon. Should we wake her up? A. sleeps B. is sleeping C. has been sleep D. has been sleeping 31. Trafalgar is…………….. . A. a cape B. a town C. a square D. a bay 32. Loch Ness is…………………………. . A.a person B.a valley C.a lake D.a river 33. The London Dungeon ………………..its visitors on a journey through England's bloody histories. A. is talking B. took C. has took D.takes 34.While you……………. around the Dungeon, watch out for creepy creatures - the Dungeon employs actors to give its visitors the fright of their lives. A. are walking B. walks C. walked D.have walked 35. Passengers ………………. to smoke in the train. A. are not allowed B. had not allowed C. has not allowed D. will not allow 36. What is the name of the most famous clock in Britain? A. Big Clock B. Big John C. Big Apple D. Big Ben 37 …………….. the Di Vinci Code? It's an interesting book? A. Have you ever reading B. Have you ever read C. Has you read D. You have read 38.Which country doesn't speak English as an official language? A. England B. Australia C.Singapore D.Korea 39. The roof may have been leaking for the past few weeks but you do not have to worry about it any longer. It …………now. A.was repaired B. is repairing repaired C. has repaired D. is being repaired 40.Charles …………….his father in the shop until school………………. . A.was helping, will start B. helped, was starting C. is helping, starts D. has helped, is starting 41. Singapore is famous for its..............................and green trees. A. cleanliness B. cleanly C. cleaning D. clean 42. On Christmas Eve, most big cities, especially London are.............................. with colored lights across the streets and enormous Christmas trees. A. decorated B. hang C. put D. made 43. In the United States there are 50 ............................ and six different time zones across the country A. states B. nations C. towns D. countries 44. I once tried to ………………… apple pie when I was in London. It was really delicious. A. do B. cook C. make D. show 45. You should go to Canada in summer because it is the most popular time for visitors to………… Niagara Falls and see the beautiful sights there. A. stay B. look C. tour D. visit 46. Nowadays you still see the ……………… men where kilts (skirts) to wedding or other formal occasions. A. Scottish B. Scotland C. Scots D. Scot 47. The USA has a population of about 304 million, and it is the third …………………country in the world. A. smallest B. largest C. narrowest D. highest 48. In some English speaking countries, turkey and pudding are.............................food at Christmas. A. national B. historical C. traditional D. possible 49. New Zealand ...........................lovers of nature and fans of dangerous sports. A. attracts B. keeps C. calls D. asks 50. Queenstown in New Zealand has got beautiful ……… and a dry climate, so it's ideal for outdoor activities. A. look B. viewing C. atmosphere D. scenery

Mình cần gấp trong ngày hôm nay ạ

Làm hộ mình bài 2 dc ko các bạn

Xét x có phải là tập nghiệm của phương trình không? b. x^2-3x+7=1+2x;x=2

hãy tưởng tượng mình là chủ tịch của 1 câu lạc bộ ở trường. hãy viết 5 câu về kế hoạch hoạt động của câu lạc bộ trong năm nay trong đó có sử dụng thì hiện tại đơn diễn tả tương lai