30 điểm : Giúp mik bài 5 : Cố gắng làm xong trong tối nay

cho ba số 25;-15; -x (x thuộc Z) tìm x biết a, tổng của ba số trên bằng 50 b, tổng của ba số trên bằng -35 c, tổng của ba số trên bằng -10

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!