Cho A(-1; 2), B(3; -1), C(3; 6) a) Tìm tọa độ vec tơ AB, vec tơ AC b) Tính Vec tơ AB. vec tơ AC Vec tơ AB. Vec tơ BC c) tìm độ dài các cạnh của tam giác ABC, từ đó suy ra tam giác ABC là gì? d) Tính các góc của tam giác ABC e) Tính diện tích tam giác ABC Giúp e với ạ e đang cần gấp ạ e cảm ơn

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II. Choose only ONE correct answer to fill in each sentence to complete these pairs of sentences, using the Future Simple, the Future continuous or the Future Perfect. 1. A: will being B: will be C: will have been a: I .................................................... in London next year, still doing the same old job. b: I ................................................................ in London for ten years by next June. 2. A: will have finish B: will be finishing C: will finish a: By Friday, I .......................................................... this new book by Marquez. b: If I don’t have too much work this year, I think I ..................................... all of Marquez’s novels. 3. A: will have slept B: will be sleeping C: will sleep a: Don’t make too much noise after midnight – I ................................................. soundly, I hope. b: Wake me up by nine o’clock – I ............................................. long enough by then. 4. A: will have flown B: will be flying C: will fly a: We .................................................... to Australia later this summer. It’s a long flight. b: It’s strange that when we get to Sydney, we ........................................ half way round the world. 5. A: will be driving B: will drive C: will have driven a: Look, I can give you a lift to the station – I .......................................................... that way anyway. b: You’ll be late for your train – I .......................................................... you to the station if you like.

I. Choose the correct answer. MUSIC What kind of music do you (1) .............? Some people like going to (2) ............. concerts, and listening to (3) ............. The (4) ............. wear very formal clothes, and the (5) ............. is silent until the end of the (6) ............. Perhaps you're a rock music (7) ............. Rock concerts are often held at football (8) ............. or in parks. (9) ............. of the audience dance to the music, or sing the songs. (10) ............. music is (11) ............. at weddings and parties in many countries, and some people (12) ............. their own music at home. Nowadays we (13) ............. music in shops and lifts, and many people (14) ............. their own music with them, or even (15) ............. to music when they study. Music is everywhere! 1. A. listen B. enjoy C. have D. preferring 2. A. classic B. classics C. classical D. classified 3. A. a group B. an orchestra C. a band D. a record 4. A. musicians B. actors C. musicals D. instruments 5. A. spectators B. people C. guests D. audience 6. A. happening B. action C. music D. performance 7. A. fan B. enthusiasm C. reader D. friend 8. A. matches B. stadiums C. pitches D. pools 9. A. Members B. Selections C. Persons D. Those 10. A. Historical B. Nation C. Traditional D. Ancient 11. A. acted B. formed C. done D. played 12. A. do B. get C. make D. take 13. A. listen B. hear C. perform D. understand 14. A. carry B. wear C. lift D. play 15. A. hear B. have C. follow D. listen