Rút gọn biểu thức Hãy giúp tôi

giá trị của biểu thức : a +(b- 2520): c; với a =4425; b = 4620 và c = 5 là bao nhiêu

Mn giúp mình với cần gấp ạ Phần B bài I ạ

6 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. The word ‘it’ in paragraph 2 refers to ___________. A: dream B: computer C: the Internet D: IAS 7 Choose the sentence so that it has similar meaning to the first one. Question 25. DIY skills aren’t as hard to learn as I think. A: DIY skills are easier to learn than I think. B: DIY skills are easier to learn. C: DIY skills are easier to learn as I think. D: I think DIY skills are easier to learn. 8 Choose the best answer a, b, c or d to complete the sentence. Question 7. On YouTube you can find many videos on _______ all aspects of your English. A: improving B: working C: surfing D: taking 9 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. What is the best title of the passage? A: Hooked on the Net B: Impact of Internet on teens C: The advantage of the Internet D: A guide to the Internet 10 Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. Question 11. My mother usually spends her free time looking after her cats. A: looking at B: taking after C: taking over D: taking care of

Một động cơ điện cung cấp suất 15kW cho 1 cần cẩu nâng 1000kg lên cao 30m. Lấy g=10m/s^2.tính thời gian tối thiểu để thực hiện việc đó

Cột A 1.Cặp NST tương đồng 2.bộ NST lưỡng bội 3.bộ NST đơn bội Cột B a.là bộ NST chứa các cặp NST tương đồng b.là bộ NST chứa 1 nửa của mỗi caqpj tương đồng c.là cặp NST giống nhau về hình thái .kích thước Đáp án Hãy so sánh với sơ đồ lai trong phép lai phân tích về 2tt của MD

Cho tam giác ABC nhọn nội tiếp đường tròn (O). Các tiếp tuyến tại B và C cắt nhau tại N. Vẽ dây AM song song với BC, đường thẳng MN cắt đường tròn tại điểm thứ hai P. Đoạn thẳng AP cắt BC tại D. a. Chứng minh rằng: BD=DC b. Giả sử $\frac{1}{OB2}$ +$\frac{1}{NC2}$ =$\frac{1}{16}$ .Hãy tính độ dài đoạn BC.

d) (x – 2)3 + (3x – 1)(3x + 1) = (x + 1)3 e) (x + 1)(2x – 3) = (2x – 1)(x + 5) f) (x – 1)3 – x(x + 1)2 = 5x(2 – x) – 11(x + 2) g) (x – 1) – (2x – 1) = 9 – x h) (x – 3)(x + 4) – 2(3x – 2) = (x – 4)2 i) x(x + 3)2 – 3x = (x + 2)3 + 1 j) (x + 1)(x2 – x + 1) – 2x = x(x + 1)(x – 1) thanks!

IV. Choose the word which best fits each gap. The Temple of Literature was (1) …….. in 1070 under Ly Thanh Tong’s dynasty. The temple is divided into five courtyards. The first courtyard stretches (2) ……… the main gate to Dai Trung gate. The second stands out with Khue Van Cac Pavilion. The third courtyard is (3)…….. doctor names were listed on stone tablets above tortoise backs. There are a total of 82 tombstones, with names and places of birth of 1307 doctors. The fourth courtyard is dedicated to Confucius and his 72 honoured students, as (4) …….as Chu Van An – a famous teacher known for his devotion to teaching. The last and also furthest courtyard is Thai Hoc house, which used to be the Imperial Academy (QuocTuGiam) – the first (5) …….of Vietnam. Thai Hoc house holds a small (6) ……… of old time costumes for students and mandarins. 1. A. construct B. build C. erected D. considered 2. A. since B. from C. to D. in 3. A. when B. who C. what D. where 4. A. long B. good C. well D. far 5. A. university B. temple C. house D. academy 6. A. collect B. colleting C. collection D. collective V. Read the text carefully then answer the questions. Community service is work done by a person or group of people that benefits others. It is often done near the area where you live, so your own community gets the benefits of your work. You do not get paid to perform community service, but get to learn a lot. Community service can help many different groups of people, even animals and the environment. Community service is often organized through a local group, such as a place of worship, school, or non-profit organization, or you can start your own community service projects. Community service can even involve raising funds by donating used goods or selling used goods like clothing. Many people participate in community service because they enjoy helping others and improving their community. 1.What is community service? …………………………………………………………………………………………. 2.Where is community service often done? …………………………………………………………………………………………. 3.Is community service a paying job? …………………………………………………………………………………………. 4.What groups of people can community service help? …………………………………………………………………………………………. 5.Is donation of used goods a community service example? …………………………………………………………………………………………. 6.Why do many people take part in community service? …………………………………………………………………………………………. VI. Write the second sentences so that it has the same meaning to the first one. 1. What a luxurious car! How…………………………………………………………………….! 2. No one can runs faster than me I am……………………………………………………………………. 3. Is there a library in your school? Does …………………………………………………………………..? 4. Shall I bring you a cup of tea? Would…………………………………………………………………? 5. You should take warm clothes because it’s very cold in Sa Pa. You had ………………………………………………………………. 6. Let’s pay a visit to Huong Pagoda. Why don’t ……………………………………………………………. 7. Jane didn’t go fishing yesterday because it rained heavily. Because of ……………………………………………………………. 8. His idea is different from mine. His idea is not ………………………………………………………… VII. Write the questions for underlined words or phrases 1. The stamps for your letter cost 8000 dong ………………………………………………………………………………. 2. Nam needs a phone card because he wants to give his father a call ………………………………………………………………………………. 3. There are over 1000 stamps in my collection ………………………………………………………………………………. 4. I’d like to buy some local goods ………………………………………………………………………………. 5. Nam calls his parents twice a month ………………………………………………………………………………. VIII. Arrange the words to make sentences. 1.who/more/don’t/attentive/arts/students/than/study/those/who/are/. ………………………………………………………………………………. 2. you/ some/ clean/ yourself/ avoid/ diseases/ by/ can/ keeping. ………………………………………………………………………………. 3. electric cooker/how much/in/rice/left/the/is/? ………………………………………………………………………………. 4.father/don’t/either/and/horror/watches/my/never/films/I/. ………………………………………………………………………………. 5. too much/ bad/ television/ watching/ for/ health/ your/ is? ……………………………………………………………………………….

Tính bằng cách thuận tiện nhất : a) 3,45 x 123 - 3,45 x 23 b) 21,2 + 7,63 + 8,8 + 2,37