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Rút gọn các biểu thức sau: a/ (x – 1)(x^2 + x + 1) – (x + 1)(x^2 – x + 1)
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Các câu hỏi liên quan

1.The cattle drank from a river_______ with toxic chemicals. A. pollute B. pollution C. pollutes D. polluted 2.Finally, my friend Lan suggested _______ to the beach instead of going camping. A. go B. to go C. going D. having gone 3. I am sure they will be very_______at your success. A. delight B. delighted C. delighting D. delightful 4. If you want to put up a tent, you will have to look for a nice flat piece of _______. A. ground B. soil C. earth D. floor 5. The day-to-day _______of the company is left to a board of directors at the top. A. working B. establishing C. running D. all are correct 6. _______ , he was unharmed after being hit by lightning. A. Consequently B. Finally C. Cautiously D. Miraculously 7. I think its a bit un real to hope that we can beat them easily. They are much younger and better. A. reality B. really C. realised D. unreal 8. Nobody can approve of his _______ to work. He is so irresponsible. A. character B. behavior C. attitude D. manner 9. The old man is _______of walking 100 meters by himself. A. inexperienced B. incapable C. unable D. immature 10. Why are you whispering to each other? If you have something important _______, say it aloud to all of us. A. to say B. said C. saying D. say 11. Each of the 4 types of human _______suited for a specific purpose. A. tooth are B. teeth is C. tooth is D. teeth are 12. _______my friends has watched the film yet. A. No B. Not any of C. None D. None of 13. In many countries there are national companies belonging to the state, _______private companies. A. including B. as well C. together with D. but also 14. We all know that it is important _______ medical directions to be understood clearly. A. with B. for C. of D. in 15. _______chooses to be honest is, certainly, nearer to God. A. Anyone B. Who C. Anyone of us D. Whoever 16. That honest man always speaks _______ is true even if it is bitter. A. that it B. that C. what D. which 17. The progress made in computer technology _______the early 1960s is remarkable. A. in B. for C. since D. during 18. Did you apologise to Mary, _______? A. who you spilt some coffee on her dress B. you spilt some coffee on her dress C. whose dress you spilt some coffee D. whose dress you spilt some coffee on 19. We are considering having_______for the coming New Year. A. redecorated our flat B. to redecorate our flat C. our flat to be redecorated D. our flat redecorated 20. You look so tired! You _______out too late last night. A. had to be B. should have been C. had been D. must have been 21. I _______ an important phone call from America. Could you tell me when it comes? A. had expected B. have been expecting C. expected D. am expecting 22. I _______ a better job, and I am going to accept it. A. was offering B. have been offered C. was going to be offered D. am offering 23. He’s always shown an understanding of what consumers want. A. people who buy something from a shop B. people who steal something from a shop C. people who doesn’t believe in God D. people who is not brave 24. The UFO stayed in the sky for about thirty seconds, and then it went away A. disappeared B. appeared C. flew D. traveled 25. The necklace is interesting but not precious. A. invaluable B. very valuable C. worth a lot of money D. B and C are correct 26. A: Would you mind lending me your bike? A. Yes, here it is B. No, not at all C. Yes, let’s D. Good idea 27. A: Would you like to have lunch with us? A. All right B. Yes, I would C. No, I wouldn’t like D. Yes, I’d love to 28. A: Why don’t we go for a picnic this weekend? A. What do you suggest? B. Yes, please C. How’s that? D. That’s a good idea 29. A: Congratulations on your winning A. You’re welcome B. That’s very kind of you C. No, thanks D. Yes, of course 30. A: Shall I get a taxi for you? A. Yes, I’d love to B. Oh, that would be nice C. Let’s do D. Yes, why not? 31. A: Could you mail this letter for me, please? A. No, I couldn’t B. I’ll try C. Yes, here it is D. I’m sorry, I can’t 32. A: How about going out to dinner tonight? A. Oh, thank you B. Yes, please C. No, I don’t want to D. I’m afraid not 33. She has taught English here _______ 10 years. A. in B. for C. since D. from 34. They _______ me if I could speak Japanese A. told B. said C. talked D. asked 35. Mrs. Lan lives here, _______? A. does he B. doesn’t he C. does she D. doesn’t she 36. If Ba became rich, he _______ travel around the world A. can B. will C. would D. should 37. If Ba _______ here tomorrow, I will phone you A. come B. will come C. came D. comes 38. Tornadoes can suck up anything that is _______ their path A. on B. in C. at D. for 39. Nhan _______ to the sea when she lived in Hai Phong A. goes B. has gone C. used to go D. is going

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