Đáp án:
Giải thích các bước giải:
Ta có: I là giao điểm của các đường phân giác của góc B và góc C, ID vuông góc với AB, IE vuông góc với AC (gt)
⇒ ID=IE ( t/c đường phân giác trong tam giác)
Vì sao các nước tư bản phương Tây đẩy mạnh việc xâm chiếm thuộc địa? A: Vì muốn gây ảnh hưởng của mình với nước khác. B:Vì sự phát triển của cách mạng công nghiệp. C: Vì nhu cầu về tài nguyên, nhân công, thị trường tiêu thụ hàng hóa. D:Vì muốn mở rộng lãnh thổ của mình.
Trong x gam quặng sắt hematit có chứa 5,6 g Fe. Khối lượng Fe2O3 có trong quặng đó là
Nêu nguyên tắc điều chế và thu khí oxi trong PTN. Giải thích cơ sở của 2 cách thu khí.
II. Rerrange the following sentences into the correct order. 9. early/ tomorrow / will /we /at five o’clock/ leave /we/the house/ get up/ must /because. =>..................................................................................................................................... 10. the/ Mid-Autumn Festival/ I / like / every / it / year / look forward / to / and/. =>....................................................................................................................................... GIÚP VS!!!!!!!!!!!!!!!!!!!!!!
tìm một số tự nhiên để khi nhân số đó với 12345679 thì được 1 số toàn chữ số 9 ghi lời giải đầy đủ
1/ x.(x+7)=0 2/(x+12). (x-3) =0 Các cậu giúp mình với~ mình cảm ơn:3
Cho hình thang ABCD ( AB // CD ) với AB = a ; CD = b. Gọi I là giao điểm của hai đường chéo . Đường thẳng qua I và song song với AB cắt hai cạnh bên tại E và F. Chứng minh rằng : EF=2ab/a+b GIÚP VỚI MÌNH ĐANG CẦN GẤPPPPPP
Bài 1 : Tìm x: 1. 17 – x = 7 – 6x 2. 3x + (-21) = 12 – 8x 3. x + 15 = 20 – 4x 4. 8x + |-3| = -4x + 39 5. 6(x – 2) + (-2) = 20 – 4x Bài 2: Tìm x: 1. 2(4x – 8) – 7(3 + x) = |-4|(3 – 2) 2. 5(x – 30) – 2(x + 6) = 9 Bài 3: Tìm x thuộc Z: a. 1 : (x – 1) là số nguyên b. -3 : (x – 2) là một số nguyên c. -5 : (x – 4) là một số nguyên d. 3x chia hết cho (x + 2) Bài 4: Tính tổng các số nguyên x: a. x chẵn và 6 ≤ x ≤ 202 b. x lẻ và 7 < x < 2017 c. 12 x 2017 và x chia hết cho 5 Bài 5: Tính tổng: c. S = 2 – 4 + 6 – 8 + … + 2008 – 2010 Giải hộ rồi e cho 5 sao, hay nhất, cảm ơn ak.
1.Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “My favorite leisure activity is people watching.” “_______” A: That’s all right. B: OK. That’s very kind of you C: That sounds so weird! D: Sure. It’s very entertaining. 2 Choose the word whose underlined part is pronounced differently from the others. A: found B: out C: sound D: enough 3. Choose the best answer a, b, c or d to complete the sentence. Question 5. How much time do you spend _______ leisure activities? A: on B: for C: with D: in 4. 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 fancy 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 interested in hanging out with friends on Saturday evening. 5. 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. Internet addicts find it hard ___________. A: to use the Internet in the morning B: to spend more time on the Internet C: to lie about the time they spent online D: to spend less time on the Internet 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.
Bài 1: một khu đất hình chữ nhật có chiều rộng 200m và kém chiều dài 300m. Diện tích của khu đất đó bằng: A.6ha b.0,6ha c.10ha d.1ha Bài 2 : Tính giá trị biểu thức : 3,2 × 0,6 + 6,28 ÷ 2 Bài 3: Tìm x : A) x - 3,45 = 90,45 ÷ 15 B) 3/5 ÷ x = 1/2 + 2
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