Gọi H là giao điểm của AC và DM , Q là giao điểm BE và MF , O là trung điểm HQ . Chứng minh rằng O nằm trên một đường cố định khi M thay đổi.

Đề bài: Giải phương trình bằng 2 cách khác nhau (theo bài: Phương trình bậc hai một ẩn)

Câu 5. Biết 7 < a < 25 và 91 a. Số tự nhiên a là : А. 13 В. 17 С. 19 D. 23.

Bài 3: Khoanh tròn vào câu trả lời đúng 1. My sister (go/goes) ice skating every winter 2. They seldom (have/has) dinner with each other. 3. I (come/ comes) from Ha Noi, Viet Nam. 4. Jim and I (don’t/ doesn’t ) go to school by bus. 5. His hobby (is/are) collecting stamps 6. Jane and I (am/ are) best friends. 7. My cat doesn’t (eat/eats) vegetables. 8. (Does/ Do) your mother finish her work at 4 o’clock? 9. We (watch/watches) Tv everyday. 10. Peter never (forgets/ forget) to do his homework. 11. Tom always (win/ wins) when he plays chess 12. (Do/ Are) you a student? 13. Mice (is/are) afraid of cats. 14. How does your father (travel/ travels) to work everyday? 15. They sometimes (go/goes) sightseeing in rural areas.

54. Error recognition: (A) Could you tell me (B) what the air conditioner (C) use (D) for? 55. Error recognition: We (A) are going to (B) study tonight (C) until we (D) will finish this chapter 56. Last night, when she came, we already (prepare) everything ___________ 57. My lawyer ( advise ) me (not / say ) anything further about the accident yesterday _________ __________ 58. I remember (meet) you somewhere last month ___________ 59. We (not/live) in England for the last two years __________ 60. This is the second time I (meet) her. I met her once last year ___________ 61. We met Tom just two days ago (make a question)  ………………………………………………………………………….. 62. I regretted selling my car I wish…………………………………………………………………………………………………… 63. “How old is your little girl now?” said the doctor to Mrs. Brown  The doctor………………………………………………… 64. He cannot speak because he is too angry He is so……………………………………………………………………………. 65. I regretted buying this old car I wish…………………………………………………………………………………………….. 66. He studies English because it is an international language (make a question)  ………………………………………… 67. “Where are you living now?” said the doctor to Mrs. Brown  The doctor………………………………………………….. 68. He cannot speak because he is too angry If…………………………………………………………………………………..

Cho hàm số bậc nhất y=ax-4 (1). Xác định hàm số a trong mỗi trường hợp sau a) Đồ thị của hàm số (1) cắt đường thẳng y=2x-1 tại điểm có hoành độ bằng 2 b)Đồ thị của hàm số (1) cắt đường thẳng y=3x+2 tại điểm có hoành độ bằng 5

yếu tố nghệ thuật là j kể tên và nêu ví dụ

Nhu cầu xử lí thông tin giảm tải là: A. Dễ so sánh B. Dễ in ra giấy C. Dễ học hỏi D. Dễ di chuyển

Hỗn hợp Na và K tác dụng hết với H2O cho 22,4 lít khí h2 (dktc) và dung dịch B. Trung hòa dd B bằng dd HCl 0,5M rồi cô cạn dd thu được 13,3g muối khan a)Tính thể tích dd HCl đã dùng b) Tính %m mỗi kim loại

Mark the letter A, B,C or D on your answer sheet to indicate the option that best complete each of the following exchanges. Question 23: John:“My first English test was not as good as I expected.” Jack: “-___________.” A. Good heaven! B. Very well, thanks. C. Never mind, better job next time D. How do you do? Question 24: Peter:“ Why don’t we wash our hands regularly to avoid coronaviruss?” David: “___________.” A. Thank you! B. Yes, let’s do that C. Not at all D. You’re wecome. Reading the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the questions from 25 to 29. Tigers are one of the most powerful and graceful animals in the world. The different species that still exist today, namely the Bengal, Indochina, Siberian, South China and Sumatra tigers are in danger of becoming extinct. Due to irresponsible hunting, the Bali, Caspian and Java tigers have already become extinct. This could soon happen to the other species too. In the past, tigers were considered as pets. With a smaller area to hunt, as man had taken up more of the land to build upon, the tigers found less area for themselves to hunt. They thus turned to farms to get their food. Farmers‘ livestock were attacked by these tigers. People were then encouraged to hunt and kill these animals with the promise of rewards. Even after the threat of tigers on livestock was over, man continued to hunt tigers, this time for recreation. Poachers hunt tigers for their body parts knowing that the skin of tigers is much bought after. Bones and other organs are also used as ingredients in traditional Chinese medicine. Although killing is illegal, it is still being carried out unless it is stopped, the remaining species of tigers will soon become extinct too. Question 25: How many species of tigers were there originally? A. three B. four C. five D. eight Question 26: There were fewer hunting grounds for the tigers because __________ A.man had occupied the land B. the farmers put their livestock there C. the tiger population was becoming bigger D. they liked hunting livestock Question 27: Man continues hunting tigers even they are no longer pets because A.he treats it as a form of recreation B. he loves tigers very much C. he still thinks tigers are pets D. he wants to make the tigers extinct Question 28: Poachers are people who _________ A.look after tigers B. make Chinese medicine C. hunt tigers illegally D. hunt tigers‘body parts Question 29: Illegal poaching will ________ A.cause the extinction of tigers B.increase the amount of Chinese medicine C.increase the amount of Chinese medicine D. increase the price of body parts