Đáp án:
Giải thích các bước giải:
2n -1 là bội của n + 32n + 6 - 7 là bội của n + 37 là bội của n + 3n + 3 thuộc U(7) = {-7;-1;1;7}n + 3 = -7 ⇒ n = -10n + 3 = -1 ⇒ n = -4n + 3 = 1⇒ n = -2n+ 3 = 7 ⇒ n = 4Vậy n thuộc {-10 ; -4 ; -2 ; 4}
cho đường thẳng a và ba điểm A,B,C không nằm trên đường thẳng a trong đó đường thẳng a không cắt đoạn thẳng AB và cắt đoạn thẳng AC a, đường thẳng a có cắt đoạn thẳng BC không vì sao b, gọi tên hai nửa mặt phẳng đối nhau bờ a
Viết bài văn về cuốn sach mà em yêu thích 400 từ
Một xilanh đang chứa một khối khí ở áp suất khí quyển 1atm. Hỏi phải đẩy pit- tông theo chiều nào, một đoạn bằng bao nhiêu để áp suất khí trong xilanh tăng gấp 3 lần? Coi nhiệt độ của khí không đổi trong quá trình trên. Tính lực cần giữ pit tông khí đó, biết diện tích pit tông là 20 cm khối
Thu gọn các đa thức sau 5x2yz+8xyz2−3x2yz−xyz2+x2yz+xyz2
3/ Ở điều kiện thích hợp, khí oxi O2 có thể phản ứng với những chất nào có CTHH sau đây ? Hãy viết các PTHH Al, C, CO2, Mg, CH4, H2O, C2H2
giúp mình với nha cảm ơn mấy bạn nhìu nhìu
số nghịch đảo của -1/4 là
Axit HCL có thể tác dụng với chất nào sau đây , viết phản ứng xảy ra: AL ,Mg(OH)2, Na2SO4 , FeS , Fe2O3, Ag2SO4 , K2O ,CaCO3, Mg(NO3)2
16 Choose the best answer a, b, c or d to complete the sentence. Question 10. My favorite hobby is ______. I spend most of my free time making vases and bowls from clay. A: model making B: woodcarving C: bird watching D: pottery making 17 Choose the word whose stressed pattern is pronounced differently from the others. A: teenager B: event C: relax D: adore 18 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: IAS B: the Internet C: computer D: dream 19 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: A guide to the Internet C: Impact of Internet on teens D: The advantage of the Internet 20 Choose the underlined part A, B, C or D that needs correcting. Picture 4 A: A B: B C: C D: D 21 Mark the letter A, B, C or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 12. Do you adore skateboarding in the park this Sunday. A: dislike B: enjoy C: fancy D: love 22 Choose the sentence so that it has similar meaning to the first one. Question 22. She likes to hang out with friends on Saturday evening. A: She’s interested in hanging out with friends on Saturday evening. B: She’s keen in hanging out with friends on Saturday evening. C: She’s interested in hang out with friends on Saturday evening. D: She’s fancy hanging out with friends on Saturday evening. 23 Choose the word whose underlined part is pronounced differently from the others. A: satisfied B: bored C: socialized D: hooked 24 Choose the word whose stressed pattern is pronounced differently from the others. A: community B: detest C: addicted D: leisure 25 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: taking over B: looking at C: taking care of D: taking after
viết đoạn văn về tình hình dịch bệnh hiện nay trong đó có sử dụng thành phần tình thái và khởi ngữ IN ĐẬM 2 THÀNH PHẦN TRÊN GIÚP MÌNH NHA
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