Đáp án:
Giải thích các bước giải:
`AD ⊥DC, BC⊥CD, AB //// DC, AD //// BC`
AB song song với DC
AD song song với BC
DA vuông góc với AB
BC vuông góc với CD
AD vuông góc với DC
BA vuông góc với BC
Mn ơi giúp mik với ạ mik đang gấp! Thanks mn nhìu
Exercise 2: Chọn phương án đúng 1. George wouldn't have met Mary to his brother's graduation party. A. if he has not gone B. had not he gone C. had he not gone D. if he shouldn't have gone 2. ten minutes earlier, you would have got a better seat. A. Were you arrived B. If you arrived C. If you hadn't arrived D. Had you arrived 3. If she a car, she would go out in the evening. A. have B„ has C. has had D. had 4. Without your help, I the technical problem with my computer the other day. A. can't solve B. couldn't have solved C. Couldn't solve D. Weren't solved 5. The joke would not be funny if it into French. A. has been translated B. be translated C. was be translated D. were translated 6. We on the beach now if we hadn't missed the plane A. might have lain B. would lie C. could be lying D. would have lain 7. I think you should stop smoking. A. If I am you, I will stop smoking. B. If I had been you, I would stop smoking, C. If I were you, I would stop smoking. D. If I were you, I will stop smoking. 8. If he had been more careful, he A. won't fall B. wouldn't fall C. wouldn't have fallen D. would haven't fallen 9. His health would be improved A. if he continued to smoke heavily B. unless he stopped smoking heavily C. if he gave up smoking D. if only he doesn't smoke any more. 10. He was driving very fast because he didn't know the road was icy. A. If he knew the road was icy, he wouldn't drive so fast. B. He hadn't been driving very fast if he would have known the road was icy. C. If he had known the road was icy, he wouldn't have been driving so fast. D. He wasn't driving very fast if he would know the road was icy. 11. I didn’t know that you were at home. I didn't visit you. A. If I knew that you were at home, I would visit you. B. If I had known that you were at home, I would have visited you. C. If I knew that you had been at home, I would have visited you. D. If I would know that you were at home, I visited you. 12. If Nam had passed the GCSE examination, he to take the entrance examination to the university. A. would have been allowed B. would have allowed C. will have allowed D. would allow 13. If it had not rained last night, the roads in the city so slippery now. A. would not be B. must not be C. could not have been D. would not have been 14. She helped us a lot with our project. We couldn't continue without her. A. Unless we had her contribution, we could continue with the project. B. But for her contribution, we could have continued with the project. C. If she hadn't contributed positively, we couldn't have continued with the project. D. Provided her contribution wouldn't come, we couldn't continue with the project. 15. What noisy neighbors you've got! If my neighbors as bad as yours, I crazy. A. are; will go B. were; would go C. had been; would have gone D. are; would go 16. If he the lesson yesterday, he could do the test better today. A. has reviewed B. had reviewed C. will review D. reviewed 17. If I hadn't had so much work to do, I would have gone to the movies. A. I never go to the movies if 1 had work to do. B. Because I had to do so much work, I couldn't go to the movies. C. I would go to the movies when I had done so much work. D. A lot of work couldn't prevent me from going to the movies. 18. Unless you well-trained, you to the company. A. aren't; will never be admitted B. aren't; will never admit C. are; will never be admitted D. are; will never admit 19. If the prisoners attempt to escape from prison, immediately. A. they will have caught B. they will catch C. they will be caught D. they would be caught 20. If it warm yesterday, we would have gone to the beach. A. was B. were C. had been D. could be.
câu 4 nha mong anh mạnh hoặc anh cường giúp đỡ
Tìm GTNN của biểu thức A=(x+3y-5) ²-6xy+26
1.tả cảnh trường em 2.Viết một đoạn văn tả một vườn rau (hoặc vườn hoa ,vườn cây ăn quả) có so sánh,nhân hóa,dùng từ gợi tả và miêu tả,ít nhất là 3 loại cây. (ko sp,kocopy)
Mng giúp em ạ, em cầm gấp ạ Em cảm ơn mng nh ạ!
1/ 2 + căn 3 + căn 2/ căn 6 - 2/ 3 + căn 3
Hợp chất gồm 1 ng tố x liên kết với 2 oxi và nặng = 2 lần khí oxi tìm phân tử khối của hợp chất
Viết một đoạn văn diễn dịch khoảng tám đến 10 câu nêu cảm nhận của em về bốn câu thơ đầu của đoạn trích cảnh ngày xuân trong đó có sử dụng một phép thế Ko chép mạng nhé
VI. Turn these sentences into passive voice: 1. My father waters these flower trees every morning. ……………………………………………………………………………………………… 2. John invited Fiona to his birthday party last night. ……………………………………………………………………………………………… 3. Her mother is preparing the dinner in the kitchen. ……………………………………………………………………………………………… 4. We should clean our teeth twice a day. ……………………………………………………………………………………………… 5. Our teachers give us a free period this Saturday to prepare the festival. ……………………………………………………………………………………………… 6. People invented the wheel thousands of years ago. ……………………………………………………………………………………………… 7. Are they building a statue of Chu Van An? ……………………………………………………………………………………………… 8. Did you buy this dictionary two weeks ago? ……………………………………………………………………………………………… 9. They will not provide pencils at the test, so please bring your own. ……………………………………………………………………………………………… 10. Mr. Binh hasn't taught us since the last semester. ………………………………………………………………………………………………
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