user-avatar
Nhung1108
2 năm trước
cho tam giác có 2 góc B và C nhọn.Trên tia đối của tia AB lấy D sao cho AB=AD,trên tia đối của tia AC lấy E sao cho AE=AC a, CM BE=D b,Gọi M là trung điểm của BE,N là trung điểm của CD.CM M,A,N thảng hàng c,Kẻ tia Ax nằm giữa 2 tia AB và AC.Kẻ BH vuông gọc với Ax,CK vuông góc với Ax.cm BH+CK nhỏ hơn hoặc bằng BC d, Tìm vị trí của tia Ax để BH+CK đạt giá trị lớn nhất
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Exercise : Supply either “BECAUSE or BECAUSE OF” as appropriate. 1. It was difficult to deliver the letter …………….…the sender had written the wrong address on the envelope. 2. We decided to leave early …………..…………….the party was boring. 3. Rescue attempts were temporarily…………………..…the bad weather. 4. They visited their friends often ……………………they enjoyed their company. 5. Paul can’t go to the football game ……………………………his grades. 6. Marcella was awarded a scholarship……………….her superiors scholastic ability 7. Nobody ventured outdoor ………………………..the hurricane warning. 8. We plan to spend our vacation in the mountains …………....the air is purer there 9. We have to drive around the bay ……………..the bridge was destroyed in the storm. 10. The chickens have died …………….the intense heat. GIÚP VỚI MN ƠIIIIIIIIIIII :D

bt 4. Supply the correct verb forms. 1. After class, one of the students always (erase) the chalk board. 2. People (spend) a lot of money on advertising everyday. 3. The phonograph (invent) by Thomas Edison in 1877. 4. For the past years, my mother (do) all my washing by hand. 5. No one (believe) his story. 6. The women in most countries in the world (give) the right to vote. 7. People (think) that Jack London's life and writing's (represent) the American love of adventure. 8. How many marks (give) to you by the teacher? 9. The detective (see) the woman (put) the jewelry in her bag. 10. Drivers (advise) to use an alternative route by police. 11. The window (break) and some pictures (take) away by the boys. 12. My father (write) the book many years ago. 13. He (show) his ticket to the airline agent. 14. The human life (completely/ change) with science and technology. 15. People (speak) English all over the world. 16. My brother (eat) a loaf of bread every morning. 17. How many languages (speak) in India? 18. The accident (cause) in this city by some drunk drivers. 19. How long they (wait) for the doctor? 20. The doctor (order) him (take) a long rest.

Giúp mình với , bài nhìn dài nhưng dễ mà , mình đăng lần 2 rồi Choose the correct alternative.( chọn phương án thay thế đúng ) ADAM: Hello, Mike. What (1) are you doing / do you do in my part of London? MIKE: Well, actually, (2) I’m looking / I look at these new flats (3) they’re building / they build down the road here. ADAM: Well, (4) they’re looking / they look quite cool, but (5) I’m thinking / I think they’re quite expensive. So (6) are you wanting / do you want to move to this area? MIKE: Yes. In fact, well, the news is that Mandy and I (7) are getting / get married. ADAM: Oh, wow! Congratulations. When (8) were you deciding / did you decide? MIKE: Only last week. It was while (9) we were staying / we stayed with her family in Scotland. Now (10) we try / we’re trying to find a suitable flat. ADAM: I hope you manage to buy one of these. MIKE: Oh, (11) we aren’t looking / we don’t look for one to buy. (12) We aren’t having / We don’t have enough money yet. (13) We’re wanting / We want to rent one. ADAM: Yes, of course. That’s what Anna and I (14) did / were doing at first. Afer that, my brother (15) was lending / lent us some money. That’s how (16) we were managing / we managed to buy ours. MIKE: You’re right. We must talk to our families before (17) we choose / we’re choosing a flat. ADAM: Yeah, my family (18) gave / were giving us a lot of help and advice. Now, what about a sandwich at my place? It’s just round the corner. MIKE: Oh yes, thanks. (19) I looked / I was looking for somewhere to eat when (20) I was bumping / I bumped into you.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team