Một bể nước dạng hình hộp chữ nhật có chiều dài 3m, chiều rộng 2m và chiều cao 1,5m. Người ta mở các vòi nước cho chảy vào bể ( không có nước ) . Biết rằng cứ 2/3 giờ thì chảy vào bể được 3000l nước . Hỏi với sức nước chảy như vậy thì bao nhiêu lâu sẽ đầy bể nước

cho 57,3g hh na2co3 và k2co3 vào dd hcl 15% vừa đủ. Dẫn lượng khí sinh ra qua nước vôi trong có dư thu được 45g kết tủa. Tính khối lượng mỗi muối trong hh đầu và nồng độ các chất sau phản ứng. AI GIÚP EM VỚI EM CẦN RẤT GẤP Ạ EM CẢM ƠN Ạ

Giải thích giùm em câu này với ạ *** Many people believe that doing sports is a good way to lose weight. A. Doing sports is believed to be a good way to lose weight. B. It is believed that doing sports be a good way to lose weight. C. A good way to lose weight is to be doing sports. D. Doing sports is believed that it is a good way to lose weight

Hỗn hợp M gồm các khí sau: C2H4, SO2, H2, CO2, CO. Bằng phương pháp hóa học làm thế nào để nhận ra sự có mặt của mỗi khí có trong hỗn hợp M. Viết các phương trình phản úng hóa học xảy ra.

Khoảng cách giữa hai điểm trên bản vẽ là 2cm. Khoảng cách thật là 1km. Tỉ lệ xích của bản vẽ là : Giari thích Để phân số 3/n - 1 có giá trị nguyên, thì tập hợp số n là : giải thích Một lớp học có 48 học sinh, trong đó 12,5 % học sinh giỏi, số học sinh giỏi là : giải thích Số hs giỏi khối 6 là 118 HS, chiếm 23,6%. Số HS khối 6 là : giải thích

Các cách để chứng minh hình thang cân

I __________do the laundry every2 days You __________ stay out too late. You ___________ break the class’s rule My mother doesn’t want me to arrive home late, so I __________ leave now. Those boys ___________ finish their homework before going out. Jim ___________ finish his essay today because he’s very busy tomorrow. Passengers___________ use phones on the plane. You __________ be late for school tomorrow. Children _______________ be accompanied by an adult when visiting this dangerous place. I ____________ be home before dinner. Students_________ talk during the exam. You ____________ cheat in a test. There _____________ be someone upstairs. I can hear the noise. We _____________ give up on what we are doing. You __________ let strangers enter the house while I’m not in. Bài 5: Hoàn thành các câu sau bằng động từ khuyết thiếu “must“hoặc “have to” và động từ trong ngoặc. I _________learn Japanese. I need itmy job. I _________learn Japanese. I love it. I _________ wake up early tomorrow.I want to watch the sunrise. I ________ wake up early tomorrow. I have a meeting early in the morning I ________ wear a black dress because I want to look good. I _______wear a black dress because that is the requirement of my company. I __________ go home now because it’s too late. I __________ go home now because I have a lot to do. I _________go to see my friend because I miss her. I _________ go to see my classmate because we work on the same project. You ________ wear a tie in the company. It‘s one of their rules. I ___________ go abroad next week. My boss wants me to sign a contract with our foreign customers. I __________ work harder. I want to be successful. This room is mess, I _____________ find time to clean it! You really ___________ stop driving so fast or you’ll have an accident! Bài 6: Điền động từ khuyết thiếu “mustn’t” hoặc “don’t have to“ vào chỗ trống để hoàn thành các câu sau. You _______________pick me up tomorrow. I will take a taxi. Look at that sign! You ___________ walk on the grass. You __________ blame anyone for your mistakes. You need to be responsible for yourself. You __________ be absent from class tomorrow because the teacher will check your attendance. I ____________ prepare dinner because we will eat out tonight. You _________ leave any rubbish here. It is forbidden. You __________ let anyone know that. It is a big secret. You __________ come early tomorrow because the event will start late. You __________ park your car here. There is a”No parking sign” We don’t have much money left. We _____________ waste anymore. They __________ forget their homework at home. I ____________ do the housework because I have a maid do it for me. They ____________ break the rule that way. It is unacceptable. I ____________ use the computer after 11pm because my mother doesn’t allow me to. You __________ buy that book. I will lend you mine. Bài7. Đánh dấu (V) trước câu đúng, đánh dấu (x) trước câu sai và sửa lại cho đúng It’s raining outside. Tim has to take his umbrella. ___ ……………………………………………………… I can give you a hand. So you mustn’t do it alone. ___ ……………………………………………………….. They mustn’t be hurry because the film starts late. ___ ……………………………………………………….. You must stop at the red light. ___ ………………………………………………………. Tomorrow is Monday but I mustn’t go to work. ___ ……………………………………………………… I am short-sighted so I must wear glasses. ___ ………………………………………………………… You mustn’t smoke here. There are a lot of children around you. ___ ……………………………………………………………………… Everyone have to bey the school’s rules. ____ …………………………………….................. It is warm today so we mustn’t wear thick coat. ____ …………………………………………………. My father will buy me a bike so I don’t have to walk to school any more. ___ ………………………………………………………………………………

Câu 5 : lúc 9 giờ 1 chiếc xe ô tô xuất phát từ A đi đến B với vận tốc 50 km / giờ . sau 1 giờ 30 phút , 1 xe máy đi từ B về A vận tốc 40 km / giờ , hia xe gặp nhau lức 13 giờ 30 phút cùng ngày tịa điểm C . A , tính quãng đường AB B , chỗ 2 xe gặp nhau cách A bao xa ?

dẫn 5,6 lít khí CO2 vào dd chứa 20 gam NaOH. tính khối lượng muối sinh ra

(2) 26. “Don’t get your shoes dirty, boys,” she said. -She told 27. “What do you want for lunch today, Peter?” Mary asked. -Mary asked 28. “Can I borrow your typewriter, Janet?” asked Peter. - Peter asked if 29. “Why didn’t I get a computer before?” thought the office manager. -The office manager wondered 30. “You had better not lend him any more money, Elizabeth,’’ said John. -John advised Elizabeth. 31. “You stole my best cassette, Amanda!” said John. -John accused 32. “ You damaged my bicycle, John!” said Mary. -Mary accused 33. “When was your little boy born?” said the nurse to Mrs. Bingley. -The nurse asked Mrs. Bingley 34. “You should take more exercise, Mr. Robert,” the doctor said. -The doctor advised 35. “Will I find a job?”, Tim said to himself. -Tim wondered 36. “I’m sorry I gave you the wrong number,” said Paul to Susan. -Paul apologized 37. “When is the first day of your holiday, Peter?” Martha asked. - Martha asked Peter when 38. “Can I have a new bicycle?” said Anna to her mother. -Anna asked 39.. “Don’t leave the house until I get back, William”, his mother said. - William’s mother told 40. “Don’t bite your nails,” said Mrs. Rogers to her son. -Mrs. Rogers told 41. “I’ve seen the film three times, Mary” said George. -George said 42. “I’m sorry, Angela,” said Martin, “I’m afraid I’ve damaged your car. -Martin apologized 43. “Have you had enough for lunch?” the landlady asked us. -The landlady asked 44. “ John, please don’t tell anyone my new address,” said Mary. -Mary asked 45. “Breakfast will not be served after 9. 30” said the notice. -The notice said that 46. “Where is the best place to buy souvenirs?” -I asked 47. “Don’t forget to bring your passport with you tomorrow” - She reminded me 48. “Do not write on the wall,” said the teacher to the boys. -The teacher told the boys 49. “How many jobs have you had since 2000?” the interviewer asked Mr. Simpson. - The interviewer asked 50. “Why didn’t you report the incident to the police?” the officer asked the frightened witness. - The officer wanted to know