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Cho ` a<b<c` là `3` nghiệm của phương trình: `x^3-3x+1=0` Chứng minh: `a^2-c=b^2-a=c^2-b=2` Không dùng Vi-ét, Vi-ét đảo
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PART 4 QUESTIONS 21-27 Read the article about burglars. Are sentences 21-27 ‘Right’ (A) or ‘Wrong’ (B)? If there is not enough information to answer ‘Right’ (A) or ‘Wrong’ (B), choose 'Doesn’t say’ (C).For questions 21-27, mark A, B or C on the answer sheet.BURGLARS LOVE THE AFTERNOON Most house burglaries happen between 2 p.m. and 6 p.m., say the police.Inspector Ian Saunders told our newspaper that the number of house burglaries has gone up by more than 30% compared with last year. He also said that 67% of burglaries happen when people have gone out and forgotten to close a door or a window.He went on to report that night-time burglaries are unusual because families are usually at home at that time. But he said that winter afternoons are the best time for burglars because it is dark and they can’t be seen easily. Also many houses are empty at that time, because people are often still at work. Inspector Saunders said that it is a good idea to leave lights on in living rooms and bedrooms when you go on holiday. This will help to keep burglars away. He also asked neighbours to watch the other houses in the street when people are not at home. They should call thepolice if they see anything strange. ‘We will also tell you how to make your house safe,’Inspector Saunders said. This kind of help costs nothing.’ 0 Most burglaries happen in the morning. B A Right B Wrong C Doesn't say 21 The number of house burglaries is the same as last year. A Right 0 Wrong C Doesn’t say 22 Most burglars are men. A Right B Wrong C Doesn't say 23 People sometimes make things easy for burglars. A Right B Wrong C Doesn’t say 24 The summer is more difficult for burglars. A Right B Wrong C Doesn’t say 25 Burglars don’t usually go to houses with lights on. A Right B Wrong C Doesn’t say 26 Burglars usually drive cars. A Right B Wrong C Doesn’t say 27 You have to pay for information from the police. A Right B Wrong C Doesn't say làm nhanh giúp e với ạ e phải nộp trc 11h15 r ạ ***Thanh kiu ve ri mắt ***

Dear Mr. Thompson, I would like to apologize to you for my actions in your class during the exam yesterday. I am so sorry that I looked in my textbook while I was taking the test. I feel terrible about (23)_________ on the test. I know that this is not an acceptable excuse, but I did not have enough time to study for the test because I had a basketball game the night before it. I was so tired that, (24)_________ I took a shower and went to bed (25)_________ . When I woke up, I remembered the test and tried to study. However, I only managed to do that for about fifteen minutes. Still, there is no justification for cheating, and I will accept (26)_________ you give me without complaint. I will also do my best to work hard in your class and to be as good a student for the remainder of the semester. Sincerely, Peter Wilson

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