1,cho tam giác ABC,đường cao AH ,CMR : a)nếu AB^2=BH.BC thì góc BAC =90 độ b)nếu HA^2=BH.HC thì góc BAC=90độ c)nếu 1/AH^2=1/AB^2+1/AC^2 và AH.BC=AB.ACthì BAC =90độ

29. "You should work harder on English pronunciation." Miss Jackson said to Tim. -> Miss Jackson said Tim should........................... 30. "Would you like to drink some coffee?" the manager said to me. -> The manager invited me............................ 31. "Where is my umbrella?" she asked. -> She asked............................................. ...................... 32. "How are you?" Martin asked us. -> Martin asked us................................................ ................... 33. He asked, "Do I have to do it?" -> He asked............................................. ...................... 34. "Where have you been?" the mother asked her daughter. -> The mother asked her daughter.......................................... ......................... 35. "Which dress do you like best?" she asked her boyfriend. -> She asked her boyfriend......................................... .......................... 36. "What are they doing?" she asked. -> She wanted to know.............................................. ..................... 37. "Are you going to the cinema?" he asked me. -> He wanted to know.............................................. ................... 38. The teacher asked, "Who speaks English?" -> The teacher wanted to know.............................................. ..................... 39. "How do you know that?" she asked me. -> She asked me................................................ ................... 40. "Has Caron talked to Kevin?" my friend asked me. -> My friend asked me................................................ ................… 41. "What's the time?" he asked. -> He wanted to know .................................................. . 42. "When will we meet again?" she asked me. -> She asked me .................................................. . 43. "Are you crazy?" she asked him. → She asked him .................................................. . 44. "Where did they live?" he asked. -> He wanted to know .................................................. . 45. "Will you be at the party?" he asked her. -> He asked her .................................................. . 46. "Can you meet me at the station?" she asked me. -> She asked me .................................................. . 47. "Who knows the answer?" the teacher asked. -> The teacher wanted to know .................................................. . 48. "Why don't you help me?" she asked him. -> She wanted to know .................................................. . 49. "Did you see that car?" he asked me. -> He asked me .................................................. . 50. "Have you tidied up your room?" the mother asked the twins. -> The mother asked the twins .................................................. .

Một đội thanh niên là công tác cứu trợ vùng bị thiên tai gồm 144 nữ và 360 nam .Người ta muốn chia đội thành nhiều tổ sao cho mỗi tổ số nam và nữ bằng nhau. a)Có bao nhiêu cách chia b)Mỗi tổ có ít nhất bao nhiêu người ?

VII. Question words 1, ............ do you go swimming ? - Twice a week. 2, ............ students are there in your class ? - Thirty-two . 3, ............ rice do you want ? - Two kilos. 4, ............ are you going to stay with your aunt ? - For three weeks 5, ............ grams of meat does he want ? 6, ............ milk do you need ? 7, ............ is there to eat ? 8, ............ does Ba do when it's cool ? 9, ............ do you have a picnic ? 10, .......... sports does Nam play ? 11, .......... do they usually go on the weekend ? 12, .......... language does he speak ? - He speaks Vietnamese

Tìm m để pt x^4-mx^2+m-1=0 Có 4nghiệm phân biệt

Lập phương trình chuyển động của hai vật có đồ thị cho trên hình vẽ 5. Ghi đầy đủ các bước dùm em với ạ!!

8. Mai told us: "It's raining heavily outside." -> Mai told us that ........................... 9. He said to his friends, "I must go home now." -> He said to his friends that ........................... 10. Hoa said, "I can't go out after 8 p.m." -> Hoa said........................... 11. Lan asked Hoa, "Can you speak French well?" -> Lan asked Hoa........................... 12. I asked Mai, "Are you free tonight?" -> I asked Mai........................... 13. Nhi asked Mai, "Do you like listening to pop music? -> Nhi asked Mai ........................... 14. She asked me, " Do you live near here?" -> She asked me ........................... 15. "Can you tell me the way to the nearest post office?" a tourist asked me. -> A tourist asked me ........................... 16. Mary asked me, " Must you go now?" -> Mary asked me ........................... 17. John said, " Is Ha Long Bay in northern Vietnam, Nhi?" -> John asked Nhi ........................... 18. " Will you come to my house for dinner?" asked Linh. -> Linh asked me ........................... 19. The teacher asked Nam, " Is Mount Everest the highest mountain in the world?" -> The teacher asked Nam........................... 20. "Do you see what I see, Mary?" said the young man. -> The young man asked Mary ________________________________________ 21. "Open the door, please!" the teacher told Nam. -> The teacher told Nam........................... 22. "Could you speak more slowly?" Hoa asked me. -> Hoa asked me........................... 23. "Would you like to go to the movies tonight?" Lan asked me. -> Lan invited ........................... 24. "Don't make noise in class." the teacher said. -> The teacher told us ........................... 25. "You should do morning exercises regularly." said the doctor to Nam. -> The doctor advised Nam........................... 26. "Can you clean up the bedroom?" said my mother. -> My mother told me........................... 27. "You shouldn't eat too much meat." the doctor said to Lan. -> The doctor advised Lan........................... 28. "Please wait for me here." My mother said to me. -> My mother asked me...........................

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