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Cho hình thang ABCD có AD//BC có diện tích S. Gọi E là giao điểm của hai đường chéo chứng minh rằng S ABE \leqslant 1/4 S

#Hỏi đáp Mathematics

ở 825 độ C hằng sô cân bằng của phản ứng: CO + H2O ---> CO2 + H2.

Nếu xuất phát từ hỗn hợp đồng phân tử của CO và H2O ở 85 độ C và ở áp suất ở 1 atm lúc cân bằng độ chuẩn hóa của CO là bao nhiêu? Nếu đô chuyển hóa của CO là 99% thì phải dùng bao nhiêu mol hới nước cho một mol CO?

#Hỏi đáp Chemistry

 

2D (g) =====> E (g)

biết mội phân tử có số mol 0.001 mol; Va= 1 l ; Vb=Vc=0.5 l;

a, A là trạng thái cân bằng, hãy tính Kc, Kp ở 298 K,

b, Trạng thái B và C, cân bằng chuyển dịch theo chiều nào ? Tính số mol mỗi chất khi cân bằng

#Hỏi đáp Chemistry

 N2O4 ----> 2NO2 ở pha khí

Trong một bình chân không thể tích 0.5 l, được duy trì ở 45 độ c, có 3.10 mol N2O4 nguyên chất. khi cân bằng đước thiết lập áp suất trong bình là 0,2 atm. xác định đọ phân hủy của N2O4 ở nhiệt đọ này vằ hằng số cân bằng Kp

#Hỏi đáp Chemistry
#Hỏi đáp Mathematics

3. You are at ___________ to do what you like.

A. freedom   B. odds  C. disposal    D. liberty

5. I have three brothers, ___________ of whom were there.

A. none       B. neither        C. no one       D. either

6. – “Why don’t we listen to some news programmes.” – “___________”

A. I don’t care for them either.

B. Because they’re usually so boring

C. Because I like pop music and I like presenter

D. Yes, whenever I’m in my father’s car!

9. – A: “Will the Browns be invited?” – B: “ I___________”

A. expect so not   B. so expect  C. expect so     D. don’t expect

(Giải thích giúp mình)

#Hỏi đáp Foreign Language
1. My children are lucky___________ the chance to visit the capital again. A. have B. having C. are having D. to have 2. Since the worldwide recession of the 1990’s, the sail of jeans __________ growing. A. stopped B. was stopped C. was stopping D. has stopped 3. They asked me how many children_________. A. I had B. had I C. I have D. have I 4. Thu said she had been_________ the day before. A. here B. there C. in this place D. where 5. You should practice_________ English to talk to your foreign friends. A. to speak B. speak C. spoke D. speaking 6. The student said that the English test__________ the most difficult. A. is B. was C. will be D. have been 7. Don’t forget___________ your dictionary with you to class. A. to bring B. bring C. bringing D. to bringing 8. The students stopped_________ when the teacher entered the classroom. A. to talk B. talk C. talked D. talking 9. There used _______ a movie theater here, but it closed a long time ago. A. be B. to be C. being D. have been 10. He wants to know whether I_______ back the next day. A. come B. came C. will come D. would come 11. ______________ laugh at me. A. Didn’t B. Won’t C. Don’t D. Haven’t 12. Tidal waves________ the result of an abrupt shift in the underwater movement of the Earth. A. are B. were C. is D. was 13. I and Kenny____________ penpal friends since I____________ Singapore. A. are-visit B. were-visited C. have been-visited D. were-have visited 14. The kids_____________ that show before. A. didn’t see B. don’t see C. aren’t seeing D. haven’t seen 15. Many mistakes ___________ made. A. has been just B. have just been C. is just D. to be just 16. Each of you _______________ a share in the work. A. having B. has C. to have D. have 17. A number of students _______________ volunteered to the job. A. have B. has C. to have D. having 18. Linguistics _______________ out the ways in which languages work. A. find B. finding C. to find D. finds 19. The United Nations _______________ its head quarters in New York city. A. have B. having C. has D. to have 20. One of my neighbours _______________ curious about other people’s private life. A. being B. were C. is D. been 21. There ____________ a few flowers in this garden last summer. A. was B. were C. are D. is 22. Much progress _______________ been made in recent years. A. have B. has C. having D. to have 23. The number of pupils getting poor marks since the beginning of the semester ____ appalling. A. to be B. have been C. are D. is 24. Five thousand pounds _________ stolen in the robbery last night. A. being B. were C. are D. was 25. One of the girls who _____________ working in this department _____________ my niece. A. is/being B. are/is C. is/are D. was/were 26. The English _____________ to drink tea. A. likes B. to like C. like D. has liked 27. Jim as well as I _____________ always busy doing English homework. A. am B. has been C. are D. is 28. That you take a computer course ____________ very necessary. A. am B. have been C. are D. is 29. The police _____________ come to the site of the accident. A. have B. has C. having D. to have 30. The pilot along with his passengers ____ rescued last night. A. am B. have been C. was D. is 31. “You shouldn’t have leaked our confidential report to the press, Frank!” said Jane. A. Jane suspected that Frank had leaked their confidential report to the press. B. Jane criticized Frank for having disclosed their confidential report to the press. C. Jane accused Frank of having cheated the press with their confidential report. D. Jane blamed Frank for having flattered the press with their confidential report. 32. “Don’t forget to tidy up the final draft before submission,” the team leader told us. A. The team leader ordered us to tidy up the final draft before submission. B. The team leader reminded us to tidy up the final draft before submission. C. The team leader asked us to tidy up the final draft before submission. D. The team leader simply wanted us to tidy up the final draft before submission. 33. “My company makes a large profit every year. Why don’t you invest more money in it?” my friend said to me. A. My friend instructed me how to put more money into his company. B. My friend persuaded me to invest more money in his company. C. I was asked to invest more money in my friend’s company. D. My friend suggested his investing more money in his company. 34. “Mum, please don’t tell dad about my mistake,” the boy said. A. The boy begged his mother not to tell his father about his mistake. B. The mother was forced to keep her son’s mistake as a secret when he insisted. C. The boy earnestly insisted that his mother tell his father about his mistake. D. The boy requested his mother not to talk about his mistake any more. 35. “If you don’t pay the ransom, we’ll kill your boy,” the kidnappers told us. A. The kidnappers ordered to kill our boy if we did not pay the ransom. B. The kidnappers pledged to kill our boy if we did not pay the ransom. C. The kidnappers threatened to kill our boy if we refused to pay the ransom. D. The kidnappers promised to kill our boy if we refused to pay the ransom. 36. "Would you like some more beer?" he asked. A. He offered me some more beer. B. He asked me if I wanted some beer. C. He wanted to invite me for a glass of beer. D. He asked me would I like some more beer. 37. “Stop smoking or you’ll be ill,” the doctor told me. A. The doctor advised me to give up smoking to avoid illness. B. The doctor suggested smoking to treat illness. C. I was ordered not to smoke to recover from illness.D. I was warned against smoking a lot of cigarettes. 38. “We’re having a reunion this weekend. Why don’t you come?” John said to us. A. John cordially invited us to a reunion this weekend. B. John didn’t understand why we came to a reunion. C. John asked us why we didn’t come to a reunion this weekend. D. John simply asked us why we wouldn’t come to a reunion 39. “Why don’t you reply to the President’s offer right now?” said Mary to her husband. A. Mary suggested that her husband should reply to the President’s offer without delay. B. Mary told her husband why he didn’t reply to the President’s offer then. C. Mary ordered her husband to reply to the President’s offer right now. D. Mary wondered why her husband didn’t reply to the President’s offer then 40. “Please don’t drive so fast, Tom,” said Lisa. A. Lisa complained about Tom’s driving too fast. B. Lisa pleaded with Tom not to drive too fast. C. Lisa insisted on Tom’s driving on. D. Lisa grumbled to Tom about driving slowly.
#Hỏi đáp Foreign Language

Cho lăng trụ tam giác đều ABC.A'B'C' , cạnh đáy a, chiều cao 2a. Gọi E,F lần lượt là trung điểm AA' , BB'. Tình V của CABEF/ V lăng trụ

#Hỏi đáp Mathematics
Gen có chiều dài 0,3876um và 2964 liên kết hiđrô. trên mạch khuôn thứ nhất của gen có nu loại t chiếm 30% số nu của mạch bảng phiên mã từ mạch khuôn của gen có 456 ribônu loại G. hãy xác định: Phân tử mARN do gen tổng hợp có bao nhiêu liên kết hóa trị Số nu mỗi loại của gen Số ribônu mỗi loại trong phân tử mARN và số nu mỗi loại trên mạch đơn của gen trên
#Hỏi đáp Biology
xét gen 1 và gen 2 .gen 1 có số liên kết hidro ít hơn số lk hidro của gen 2 là 300 trong lúc gen 2 có số lk hóa trị nhiều hơn số lk hóa trị của gen 1 là 150.cả hai gen đều trải qua quá trình nhân đôi ADN 4 lần liên tiếp đòi hỏi mt cung cấp 60750 nu tự do ,trong đó có 19800 nu tự do loại X.a)tìm chiều dài của gen b) tính số nu tự do mỗi loại mt cần cung cấp cho quá trình nhân đôi của gen c)tổng lk hiđrô bị phá vỡ,số lk hóa trị được hình thành qua quá trình nhân đôi của cả 2 gen giải chi tiết giùm em ạ
#Hỏi đáp Biology

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