Đáp án:
$A.\ 19$
Giải thích các bước giải:
\(\begin{array}{l}\quad f(x) = x^3\\\Delta y = f(x_o + \Delta x) -f(x_o)\\\text{Tại $x_o= 2;\ \Delta x = 1$ ta được:}\\\Delta y = f(2 + 1) - f(2)\\\Leftrightarrow \Delta y = f(3) - f(2)\\\Leftrightarrow \Delta y = 3^3 - 2^3\\\Leftrightarrow \Delta y = 19\end{array}\)
A
`\Delta y=f(x_{0}+\Delta x)-f(x_{0})`
`\Delta y=(x_{0}+\Delta x)^3-x_{0}^{3}`
Thay vào ta có: `\Delta y=(2+1)^3-2^3`
`\Delta y=19`
Bạn Lan đi xe đạp từ nhà đến trường,đoạn đường dài 2,826km.Bánh xe có đường kính 60cm.Hỏi bánh xe phải quay hết bao nhiêu vòng?
Giúp mình với mọi người ơi từ câu 9 đến 28
Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions. When you hear how I learned a foreign language, you have to remember a few things. In 1993, when I started learning English, no one had heard of the Internet. I wasn’t able to read websites on topics that I found interesting or follow blogs. And I have no idea how I decided which movies to see without my favourite movie review website. My reading practice was limited. All I had were a few books on sale locally. For listening practice, I only had the news and cartoons on cable TV. People bought and rented videos but in Poland there was no spoken English on them. The only way to hear that was to visit the movies. My dictionaries were all in book form until I received my first PC dictionary. It came on at least six disks and had unhelpful explanations and few example sentences. It doesn’t sound very useful but I loved it because of its ability to work with other programs and find English words more quickly. Today, computerized dictionaries have simple explanations and lots of examples. Now I can spend hours on the web, reading about my favourite topics, downloading up-to-date movies, emailing English-speaking friends and posting comments on forums. 28. The word “up-to-date” means ____________________. A. oldest B. daily C. latest D. longest 29. What is the writer trying to do in the text? ____________________. A. Encourage people to start learning in a foreign language. B. Compare two different ways of teaching a language. C. Complain about the use of technology in language learning. D. Explain how language learning materials have changed. 30. To watch films in English, Polish people in the 1990s had to ____________________. A. have cable television B. go to the cinema C. rent films on videotape D. watch TV for children 31. The writer says he doesn’t know ____________________. A. which topics he found interesting B. when he first heard about the internet C. how he used to choose films to watch D. where he bought English book online from 32. The writer liked his first computer dictionary because it ____________________. A. found information at a faster speed B. came with other computer programs C. was better than today’s dictionaries D. gave you useful example sentences Choose the second sentence which has the same meaning as that of the root one. 33. My father had gone home before we arrived. A. After my father arrived, we went home. B. After my father had gone home, we arrived. C. After my father had gone home, we arrive. D. After my father had gone home, we had arrived. 34. The children couldn’t go swimming because the sea was too rough. A. The children couldn’t go swimming because of the sea rough B. The children couldn’t go swimming due of the rough sea. C. The children couldn’t go swimming because of the rough sea. D. The children couldn’t go swim because of the rough sea. 35. I think you should spend more time improving your pronunciation. A. If I were you, I would spend more time improving my pronunciation. B. If I am you, I would spend more time improving my pronunciation. C. If I am you, I will spend more time improving my pronunciation. D. If I were you, I will spend more time improving my pronunciation.
\(\left[ \begin{array}{l}x=±\frac{pi}{3}\\x=±\frac{2pi}{3}\end{array} \right.\) Gộp hai nghiệm trên giúp mình nha mấy bạn
Có thể giúp mik vẽ tấm thiệp như trong hình ko AND kèm một pic yêu thích nhất của bn CHÚC CÁC BẠN 1-6 zui zẻ nha
LÀM GIÚP MÌNH CÂU D VỚI MÌNH ĐANG CẦN GẤP
Vẽ mầm Nếu mà là tranh trace thì không được phép kí tên mình vào hả mn ? ( Tui đang nói trong trường hợp k đăng tranh lên hoidap á )
1.Doing exercise is a good wway to lose weigh = It is a good way............................ 2.She visited Sydney in 2016 =She was............ 3.I think we should go ahead.No one disapproves of the plan. =As......................... 4.It is my sister's eighteenth birthday next week. =My sister will ....................
Cho hình thang ABCD có đáy AB bằng 12 cm, đáy DC bằng 25 cm và chiều cao BH bằng độ dài đáy DC( như hình vẽ) 1)Tính diện tích hình thang ABCD 2)Nối A với H; A với C cắt BH tại M. Hãy so sánh diện tích hình tam giác BMC và diện tích hình tam giác AMH.
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến