Cho ( O,R ) , dây cung AB Trên tia đối của AB lấy C sao cho BC=R Tia OC cắt (O) tại D (O nằm giữa C và D) a, CMR: góc AOD = 3ACD b, Cho biết AB=R Tính OC theo R

Câu 1: Trong các phản ứng sau, những phản ứng nào đúng (có xảy ra): a. 2NaHSO4 + BaCl2 → Ba(HSO4)2 + 2NaCl b. 2NaHSO4 + BaCl2 → BaSO4 + Na2SO4 + 2HCl c. NaHSO4 + BaCl2 → BaSO4 + NaCl + HCl d. 4NaHSO4 + BaCl2 → Ba(HSO4)2 + 2Na2SO4 + 2HCl Câu 2: Trong các phản ứng sau, những phản ứng nào đúng (có xảy ra): a. Mg(HSO4)2 + 2NaOH → Mg(OH)2 + 2NaHSO4 b. Mg(HSO4)2 + NaOH → NaHSO4 + MgSO4 + H2O c. Mg(HSO4)2 + 2NaOH → Na2SO4 + MgSO4 + 2H2O d. Mg(HSO4)2 + 4NaOH → 2Na2SO4 + Mg(OH)2 + 2H2O

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Exercise 1: Chọn từ có phần gạch chân được phát âm khác so với các từ còn lại: 1/ A. study B. surf C. up D. bus 2/ A. kind B. ride C. twice D. fishing 3/ A. come B. once C. bicycle D. centre Exercise 2: Chọn từ có trọng âm khác: 4/ A. library B. Internet C. cinema D. information 5/ A. partner B. swimming C. grandparents D. project

III. Choose the best annser. 6. Lan ________ her teeth after meal. A. brush B. brushs C. brushes D. brushing 7. She is a student. So_______ he. A. is B. do C. are D. does 8. The student ________ to school on Sunday A. don't go B. not go C. isn't go D. goes 9. Nga________ to her friends now. A. are talking B. talk C. is talking D. talks 10. Who ________ he live with in Ho Chi Minh City? A. does B. do C. is D. are 11. –“________ does he go to school?” –“I go by bike.” A. When B. How C. What D. Who 12. Ha Noi is a big city, but it is________ than Ho Chi Minh City. A. the smaller B. the smallest C. smallest D. smaller 13. Her parents live ________ Ha Noi A. in B. at C. on D. of 14. I like swimming, and ________ does my brother. A. too B. so C. but D. to

Cho mình hỏi tí : Giải thích tại sao √( √3 -2)² lại bằng 2- √3 mà k phải √3 -2 Làm thêm câu này đi :> √(5 -2√6)² - √(5 -2√6)² *Làm đơn giản thôi nhá mình mới học nên hiểu hơi chậm :))

II. Make questions for the underlined part in each sentence. 1. I like TV game shows best. @ ………………………………………………………………………………… 2.TV viewers can know about the weatherin their regions from the weather forecast. @ ………………………………………………………………………………… 3. We go to the zoo twice a month. @ ………………………………………………………………………………… 4. We can meet in front of the theater at 7.30. @ ………………………………………………………………………………… 5. Bob likes the comedy because it makes him laugh. @ ………………………………………………………………………………… 6. The documentary lasts forty-five minutes. @ ………………………………………………………………………………… 7. Steven Spielberg is the director of the film. @ ………………………………………………………………………………… 8. On VTV3, there are three films on this week. @ ………………………………………………………………………………… 9. Millions of children around the world enjoy the cartoon "Hello Fatty!" @ ………………………………………………………………………………… 10.Pokémon cartoons are made in Japan. @ …………………………………………………………………………………

ab^2+1/4a^2b^2+1 Ghi từng bc ra làm ơn

cho a,b,c thuộc Z và ab+bc+ca =1 chứng minh (a^2+1)(b^2+1)(c^2+1) là số chính phương

31. Jerry is a(n)________ clever little mouse. A. small B. special C. intelligent D. special 32. ‘Let’s learn’ teaches children to study Maths. It’s an__________ program. A. live B. popular C. entertaining D. educational 33. ______Mai and Lan are interested in listening to music. A. Because B. Both C. Neither D. So 34. The book is_______ the adventure of three close friends. A. on B. from C. at D. about 35. They invite special_______ to appear in the show. A. character B. guests C. foxes D. audiences 36. Millions of children___ the world enjoy the show. A. all B. in C. around C. over 37. The game show this week will test you general_____ about Amazon jungle. A. schedule B. knowledge C. fact D. adventure 38. The program can both ____ and entertain young audiences. A. educated B. education C. educational D. educate 39. The_______ I like best is Xuan Bac. A. comedy B. comedian C. fun D. funny 40. Where are the children? They_____ in the yard. A. play B. are playing C. is playing D. plays 41. Disney Channel is one of the most____ channels _____children . A. good - for B. exciting - of C. popular - to D. popular - for 42. My family enjoys watching game shows____ they are very exciting and interesting. A. because B. so C. but D. and 43. VTV is a______ television channel in Viet Nam, and it attracts millions of TV viewers in Viet Nam. A. wide B. local C. international D. national 44. "What is your____ . TV programme?" - "It's cartoons" A. good B. favourite C. best D. like 45. "______do you like the Modern English programme? " - "Because it helps me with my English." A. What B. How C. When D. Why 46. My brother wants to become a_______ to tell TV viewers what the weather is like. A. newsreader B. actor C. weatherman D. producer 47. TV_______ can join in some game shows through telephone or by mail. A. people B. weathermen C. newsreaders D. viewers 48. ______are films by pictures, not real people and often for children. A. Documentaries B.Love stories C. Cartoons D. Detective stories 49. Are there any good programs______ teenagers on TV tonight? A. to B. for C. of D. with 50. My father works late tomorrow, so he will____ the first part of the film on VTV1. A. miss B. lose C. forget D. cut