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havu02042001
2 năm trước
Cho phương trình x ²-4x+m=0 Tìm để pt có các nghiệm thỏa mãn x1<x2 và x1 ²-x2 ²=8 giúp với plsssssssssssssssssssssssssssss mod bđhh
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I. Choose the word which is stressed differently from the rest: 1. A. disaster B. prisoner C. agency D. family 2. A. international B. federation C. society D. conservation II. Choose the- word whose underlined part is pronounced differently 3. A. gold B. region C. organize D. game. 4. A. punCH B. synCHronized C. MarCH D. touCHing 5. A. visited B. decided C. engaged D. disappointed III. Choose the Best Answer: 6. When a reader reads an interesting book slowly and carefully, he _________it A. swallows B. chews and digests C. tastes D. dips into 7.’’ Thank you for your nice gift.’’ “__________________________’’ A. But do you know how much it costs ? B. You‘re welcome. C. In fact. I myself don’t like it D. I’m glad you like it. 8. “Let’s go to the movie now,’’ Oh! ________________. A. Good idea! B. I don’t C. Why’s that? D. I need it. 9. The Red List is A special book that provides names of _________animals. A. hunted B. vulnerable and endangered C. endangered D. extinct 10. He is unreliable. What he says _______ be believed. A. cannot B. must not C. may not D. might not 11. The picnic ________ because Peter has just had a traffic accident. A. will cancel B. will be cancelling C. will be cancelled D. will have cancelled 12. We have plenty of time for doing the work. We _______ be hurried. A. need not B. should not C. must not D. may not 13. _____________ books are ones in which the story is told or illustrated with pictures. A. Comic B. Thriller C. Romantic D. Science 14. I have earned my own living ___________I was fifteen. A. while B. when C. since D. as soon as 15. A __________ is the one who can keep ball with both hands. A. defender B. midfielder C. attacker D. goalkeeper 16. Air tank, regulator, wet suit, mask, fins are equipments required to play in __________. A. water polo B. rowing C. wind surfing D. scuba diving 17. Life on Earth is disappearing fast and will continue to do so unless urgent action is taken. A. vanishing B. damaging C. polluting D. destroying 18. Government have passed laws to protect wildlife from commercial trade. A. enabled B. enforced C. enacted D. ensured 19. Poisonous gases _____________ many factories destroy the ozone layer. A. over B. from C. above D. around 20. We first ________ each other in London in 2006. A. met B. have met C. meet D. had met 21. Our teacher came in when we _________noisily. A. had talked B. were talking C. Are talking D. have Been talking 22. : - “You look nice today. I like your new hairstyle.” - “ _______________” A. It’s nice of you to say so. B. Shall I? Thanks. C. Oh, we done! D. I feel interesting to hear that. 23. Jack was my_____________ in the tennis match. A. opposing B. opponent C. opposition D. opposite 24. Most Americans don’t object _______being called their first names. A. for B. to C. in D. about 25. During the lecture yesterday, he _______the importance of a good education. A. had stressed B. have stressed C. stressed D. stresses 26. You ____________shout. I'm not deaf. A. mustn't B. needn't C. shouldn’t D. can't 27. Yesterday I bought ________ umbrella in __________big shop. A. A- A B. An- the C. An- x(zero) D. An - A 28. Be careful. The vase is very heavy. You _________ drop it. A. must B. need C. have to D. might

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