Cho đường tròn tâm O, đường kính AB. Trên tiếp tuyến của đường tròn (O) tại A lấy điểm C (C khác A). Từ C vẽ tiếp tuyến thứ hai CD với đường tròn (O) (D là tiếp điểm). Kẻ DK vuông góc với AB (K thuộc AB), CB cắt đường tròn (O) tại điểm thứ hai là M và cắt DK tại N. Chứng minh rằng: a) Tứ giác AMNK nội tiếp đường tròn. b) AC^2 = CM.CB. c) MAD = OCB. d) N là trung điểm của DK.

vẽ sơ đồ đơn giản sự phân cấp phân công bộ máy nhà nước

Mọi người giúp mình trả lời với ạ

a Quangcuong giúp e Trong 1 bài toán hóa, có phải dùng hết số liệu đề bài cho không?

Giải giúp mình với mình đang cần gấp. Cảm ơn mọi người nhiều

C7: Hướng xuất phát của các dòng biển nóng và dòng biển lạnh?

Một của hàng mua một số áo với giá 480000 đ, sau đó cửa hàng bán 2 cái áo với giá tiền bằng một nửa giá mua, sau đó bán những chiếc còn lại mỗi chiếc lời được 8000 đ so với giá mua và lời tổng cộng là là 72000 đ. Hỏi cửa hàng đó đã mua được bao nhiêu cái áo?

cho mik 5 tấm bức tự vẽ nha, anime các loại

Tính nhanh 1,2 x 4,5 + 2,4 x 1,3 + 1,2 x 2,9

giúp mình với ạ :((( 1. Where’s the ______ dress that your grandma gave you? A. long pink silk lovely B. pink long lovely silk C. lovely long pink silk D. lovely pink long silk 2. Researchers are making enormous progress in understanding ______ and what causes it. A. a tsunami is what B. what a tsunami is C. is what a tsunami D. what is a tsunami Question 3. Some people tend to view foreigners with __________. A. suspect B. suspiciously C. suspicious D. suspicion Question 4. After having a bath, he _____ his supper. A. was eating B. had eaten C. has eaten D. ate Question 4. Miss Helen is the only teacher in this school to have lots of _____ in teaching young children. A. fuss B. attitude C. experience D. notice Question 6. Water _________ at 100 degree Celsius. A. will boil B. is boiling C. has boiled D. boils Question 7. I was woken by the sound of someone ____ on the door. A. bumping B. crashing C. knocking D. hitting Question 8. We haven't seen each other since we ___ school three years ago. A. have left B. leave C. had left D. left Question 9. John is an old friend of mine. We _____ each other ___ ages. A. are knowing-for B. have known-for C. know-for D. have known-since Question 10. Who _______ the car at time of the accident? A. had driven B. was driving C. drives D. drove Question 11. We must do it __ otherwise it will be too late! A. immediately B. slowly C. lately D. finally Question 12. I haven't read any novels _______ as I have been too busy. A. recently B. already C. immediately D. finally Question 13. After I ___________ finished working, I switched off the machine. A. have B. having C. had D. to have Question 14. She told him________ give up hope. A. not give B. to not give C. not to give D. to give not Question 15. Her mother asked her to________ the table for the evening meal. A. place B. lay C. spread D. put Question 16. To save energy, we should remember to________ the lights before going out. A. turn down B. turn on C. turn off D. turn up Question 17. You'll get a cold if you_________ your warm clothes. A. haven't changed B. won't change C. didn't change D. don't change Question 18. She sings as_________ as her mother. A. beauty B. beautifully C. beautiful D. beautify Question 19. My dad is a_________ smoker. He smokes every day. A. strong B. hooked C. plentiful D. heavy Question 20. Britain's Prince William arrived_________ Hanoi on Wednesday for his first visit to Vietnam. A. at B. to C. on D. in 21. ______, the less polluted the environment will be. A. The fewer landfills we have B. The more polluted landfills will be C. The less landfills are polluted D. The more landfills are there 22. It is believed ______. A. why is Alice such a talented ballet dancer B. when Alice to become a talented ballet dancer C. that Alice is a talented ballet dancer D. how is Alice a talented ballet dancer 23.“May I see your passport, Mrs Scott?” said the customs officer. A. The customs officer promised to show Mrs Scott his passport. B. The customs officer suggested seeing Mrs Scott’s passport. C. The customs officer asked Mrs Scott to see his passport. D. The customs officer asked to see Mrs Scott’s passport. 24. Susan, remember to apply this sun cream ______ two hours. A. every B. each C. some D. several 25.Parts of the country are suffering water ______ after the unusually dry summer. A. thirst B. supply C. shortage D. hunger 26. My teacher reminded me ______ my essay carefully before handing it in. A. to have checked B. to check C. checked D. checking 27. I’d rather you __ to the English-speaking club with me this Sunday. A. will come B. came C. to come D. come 28. She was ______ angry that she could not say a word. A. so B. too much C. so many D. such 29. Neither Tom nor his brothers ______ willing to help their mother with the housework. A. has been B. is C. was D. are 30. Spain has won the championship, ______ is not surprising. A. which B. that C. what D. how 31. This carpet really needs ______. Can you do it for me, son? A. cleaned B. cleaning C. clean D. being cleaned 32. They are having their house __ by a construction company. A. painted B. painting C. to paint D. being painted