Cho B = 1/4 +1/5+1/6+...+1/19 . Hãy chứng tỏ B>1

hãy nêu sự khác biệt giữa phá mã và giải mã. giúp e vs mn ơi tks nhiều lắm

Question 11: Some senators reacted (angrily) to the president’s remarks. A. aggressively B. thankfully C. surprisingly D. amicably Question 12: It is important to (keep in touch with) the latest research. A. lose contact with B. look forward to C. pay attention to D. be interested in Question 13: When you fill in the form, please write (clearly) in black ink. A. freely B. vaguely C. frankly D. hardly Question 14: In the initial days and weeks, it was literally a case of (living from hand to mouth). A. sending all the money B. spending a large amount of money C. saving lots of money D. losing all the money Question 15: When the teacher finished reading the question, Tommy raised his hand (at the drop of a hat), which surprised everyone. A. hesitantly B. watchfully C. carefully D. purposefully Question 16: He was (in the very seventh heaven) when the girl consented to be his wife. A. utterly discontented B. extremely depressed C. amazing dreamy D. very imaginative Question 17: We played my brother’s school at football and (beat them hollow). A. defeated easily B. had a draw C. broke a nil score D. lost the game Question 18: I can’t spend a lot of time talking about your problem. I (have other fish to fry). A. take the rest B. have nothing to do C. meet the friends D. have something more important to do Question 19: Nowadays female engineers are not (too thick on the ground). A. rare B. efficient C. overweight D. enormous Question 20: Though the issues raised by workers were very serious, the supervisor (made light of them). A. completely ignored B. treated as important C. discovered by chance D. disagreed with

Choose the correct functions of the sentences below.

Question 1: The government has (passed) laws to protect wildlife from commercial trade. A. enforced B. enabled C. ensured D. enacted Question 2: Only (aggressive) species of small animal life are likely to survive in the rough waters near shallow coral reefs. A. passive B. strong C. assertive D. marine Question 3: It was a mistake which eliminated any (chance) of an Australian victory. A. theory B. opportunity C. software D. problem Question 4: I went to the meeting armed with the (relevant) facts and figures. A. separate B. significant C. excellent D. natural Question 5: In cases of (severe) mental handicap, constant supervision is recommended. A. serious B. negative C. opposite D. effective Question 6: Dozens of valuable works of art disappeared during (shipment) to the US. A. awareness B. tension C. confusion D. delivery Chọn từ trái nghĩa: Question 7: All non-violent religious and political beliefs should be respected (equally). A. frankly B. differently C. properly D. joyfully Question 8:Sure, I’ve tried to live a benign life, (putting my shoulder to the wheel for) peace. A. being indifferent to B. feeling tired of C. looking happy in D. becoming strong in Question 9: Though he had tried to be enthusiastic about the plans, (privately) he felt more sceptical. A. publicly B. vainly C. desperately D. secretly Question 10:He (makes no bones about) the fact that his apartment is a mess. A. fails to ensure B. fails to confirm C. tries to show D. tries to hide

từ một tấm tôn hình chữ nhật kích thước 1m x 2m người ta gò thành mặt xung quanh của một hình trụ có chiều cao h=1 cm. Tính thể tích của khối trụ đó giúp mik vs ạ

Nung nóng một thời gian hỗn hợp A gồm Al và một oxit sắt (Giả sử chỉ xảy ra phản ứng khử oxit thành kim loại) được m gam hỗn hợp B. Chia hỗn hợp B thành hai phần bằng nhau. Cho phần thứ nhất tác dụng hoàn toàn với dd KOH dư thu được 10,08 lít khí đktc và có 29,52 gam chất rắn không tan. Hòa tan hoàn toàn phần thứ 2 bằng dd H2SO4 đặc nóng, dư được 19,152 lít khí SO2 (sản phẩm khử duy nhất, đktc) và dung dịch C. Cho dd C tác dụng hoàn toàn với dd NH3 dư, lấy toàn bộ lượng kết tủa tạo thành đem nung đến khối lượng không đổi thu được 65,07 gam chất rắn. Xác định công thức của oxit sắt và tính giá trị của m.

Không có kính rồi xe không có đèn Không có mui thùng có xước Xe vẫn chạy vì miền nam phía trước Chỉ cần trong xe có môtj trái tim C1.Phương thức biểu đạt trong đoạn thơ trên là gì C2.Chỉ ra biện pháp tu từ rong đoạn thơ trên và nêu tác dụng

III. Read the following passage and answer the questions below. The two children have been in London. They were surprised at the crowds everywhere. They decided to travel on the tube railway. They found that they had to be quick and get on the train or it would go off without them. One day they went to Hype Park and walked along on the grass to Kensington Gardens in bright autumn sunshine. This was different from the crowded streets, and Mary said that it was like being back home. The leaves of the great trees were turning red, brown and yellow, birds were flying about, there were lots of flowers and ducks swimming about on the Round Pond. Only the noise from the street in the distance reminded them of the town. 1. Where have the children been? ……………………………………………………………….. 2. What made them surprised? ……………………………………………………………….. 3. What did they decide to do? ……………………………………………………………….. 4. Where did they go one day? ……………………………………………………………….. 5. In which season did they go there? ……………………………………………………………….. IV. Choose the best option A, B, C or D to complete the sentence. 1. Overpopulation problems………………both the rich and the poor. A. cause B. reduce C. happen D. affect 2. The major cause of death for children living in the slums is……………. A. immigration B. malnutrition C. density D. illiteracy 5. The city has to find…………………….to homeless people immediately. A. calories B. solutions C. earnings D. systems 6. The immigrants will hardly find accommodation in the city,………………..? A. will they B. won’t they C. will it D. won’t it 7. Disease spreads more quickly in overcrowded areas,……………….? A. isn’t it B. doesn’t it C. is it D. does it 8. Living in the country is healthier than that in the city because in the countryside, there is…..…traffic. A. higher B. fewer C. more D. less 9. people move to the city with the hope that they can get…………..food and better healthcare. A. more B. bigger C. less D. fewer 10. ………………accidents were recorded this year than that year; 23 cases compared to 42 cases. A. Less B. More C. Fewer D. Lower V. Make the questions for the underlined parts in the following sentences 1. Most of my classmates go to school by bike ……………………………………………………………… 2. It is about three kilometres from my house to school .……………………………………………………………… 3. The students are playing football in the school yard .………………………………………………………………

Trong bài Cô giáo lớp em nhà thơ Nguyễn Xuân Sách có viết: Cô dạy em tập viết Gió đưa thoảng hương nhài Nắng ghé vào cửa lớp Xem chúng em học bài. Hãy chỉ ra biện pháp tu từ và nêu cảm nhận của nó qua đoạn thơ.