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Xét tính bị chặn của mỗi dãy số với: a. un=(2n^2+n+1)/n+2 b.un=1/(1.3)+1/(3.5)+...+1/(2n+1)(2n-1) c. un= 1/căn(n^2+1)+1/căn(n^2+2)+....+1/căn(n^2+n) Hướng dẫn cặn kẽ giúp em 3 câu trên với ạ
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Cần giải gấp I. Rewrite these sentences, as shown, so that the meaning stays the same 1. I only come if they invite me. => Unless they invite me,i won’t come 2. He didn’t revise all his lessons, he failed the exam. => If he revise all his lessons,he will pass the exam 3. His sister sent him some money, so he continued to study. => But for he study 4. The park is over there, only 5 minutes’ walk. => If you walk………………………………………......................……. 5. In case it rains, we’ll stay at home =>If it ………………………………………….........................……….. 6. Let me give you my advice. You should cut down on smoking right now. =>If I ...…………………………………………………………………… 7. Leave me alone or I’ll call the police. =>Unless you don’t leave me alone,i will call police 8. If you arrive at the office earlier than I do, please turn on the air-conditioner. => Should ……………………………………...............…………………. 9. The children don’t go to school in the snowy weather. => If it …………………………………………………………………… 10. He died so young; otherwise, he would be a famous musician by now. =>Had …………………………………………....……………………… 11. You must tell me the whole truth or I won’t help you. =>Unless………………………………………………………………… 12. The car breaks down so often because you don’t take good care of it. =>Were I…………………………………..……………………………… 13. He is very bad-tempered, that’s why his wife left him soon after marriage. =>If he……………………………....…………… ……………………… 14. Don’t tell lies to your boss or you’ll be fired at once. =>If……………………………..………………………………………… 15. She got married at an early age: otherwise, she would be at university now. =>Had ………………………………….................................................... 16. If she spoke English well. She would apply for the job. => Were………………………………….................................................... 17. I stayed up late last night so I am now very tired. => If I .........................................................................................................

The city of London, the capital of United Kingdom is a year- round tourist destination. London is the (23)………..city in Europe and located astride the famous river of Thames. This is the home for most of the international organizations and the city is headed by the Lord Mayor of London. The city of London has its own police (24)……….…, called City of London police. London is considered as both business and tourist destination and (25)…………..by millions of people annually. The Heathrow Airport, London considered as the busiest airport (26)………….…..the world. City of London provides many attractions for visitors. You can visit London museums, see Royal palaces and activities, relax on London parks and (27)………..……more places for bed and dine. London is considered an expensive city in the world and even.though its home for many foreign migrants, still keeping its traditional heritage and surrounding. 23. A. largest B. larger C. large D. largerly 24. A. team B. group C. force D. strength 25. A. visit B. visited C. visiting D. to visit 26. A. in B. at C. on D. till 27. A. lot B. a lot C. much D. many

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