Đáp án:
$D. \ f'(x) = \dfrac{2x-2}{(x^2 - 2x).\ln2}$
Giải thích các bước giải:
\(\begin{array}{l}\text{Áp dụng công thức đạo hàm:}\\\left[\log_a u(x)\right]' = \dfrac{u'(x)}{u(x).\ln a}\\\text{Ta được:}\\\quad f'(x) = \dfrac{(x^2 - 2x)'}{(x^2 - 2x).\ln2}\\\Leftrightarrow f'(x) = \dfrac{2x-2}{(x^2 - 2x).\ln2}\\\end{array}\)
$f'(x)=\dfrac{(x^2-2x)'}{(x^2-2x).In2}$
$f'(x)=\dfrac{2x-2}{(x^2-2x).In 2}$
xin hay nhất
The atmosphere protects the earth from harmful radiation from the sun. - The earth ………………………………………………….. Did anyone see you come in? - Were you ………………………………………………………? He hates people staring at him. - He hates being …………………………………………. Someone will tell her which bus to catch. - She …………………………………………………………. Thieves broke into the house. - The house ……………………………………………………….. His mother did not take care of him. - He ………………………………………………………………. They will inform you the result of the exam by letter. - You ……………………………………………………………. - The result ……………………………………………………. When will they open the shop? - When ………………………………………………………… They will serve fish to the guests about ten minutes from now. - Fish …………………………………………………. They have sold thousands of CD machines since 1980. - Thousands ………………………………………….. That company will publish a textbook next year. - A textbook ………………………………………………. My friends told me to change the way. - I …………………………………………………………. Shakespeare wrote many famous plays. - Many famous plays ………………………………………. Bill will invite Ann to the party. - Ann ………………………………………………………… Alex is preparing that report. - That report …………………………………………………… The teacher is going to explain the lesson. - The lesson ………………………………………………………. Kathy had returned the book to the library. - The book ………………………………………………………. Does professor Jackson teach that course? - Is the course ………………………………………………………? Is Mrs. Brown painting your house? - Is your house ……………………………………………………….? Doctor Ikeda developed that theory. - That theory ………………………………………………………….. A storm destroyed the small fishing village. - The small ……………………………………………. Hundreds of people visit the Washington Monument each day. - The Washington Monument …………………………………………
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EXERCISE 8: Change the active into the passive. Somebody cleans the room everyday. - The room ………………………………………………. They cancelled all the flights because of fog. - All the flights ……………………………………………….. People do not use this road very often. - This road …………………………… How do people learn languages? - How ……………………………………. People advised us not to go out alone. - We ……………………………………………… They are going to build a supermarket next year. - A supermarket …………………………………………. She is using the computer at the moment. - The computer ……………………………………………… They are opening a new ring road round the city. - A new ring road ……………………………………………….. They have built a big hospital which costs much money. - A big hospital ………………………………………………….. The girl did not give me the money. - I ……………………………………………………………….. - The money …………………………………………………. A man asked me several difficult questions at the interview. - I ……………………………………………………….. Nobody told me the story. - I ……………………………………………. - The story …………………………………………. About 30 million people are watching this program. - This program ………………………………………………… They are building some new houses down the street. - Some new houses ………………………………………………. They have moved nothing in your room. - Nothing ………………………………………………. People used oil-lamps years ago. - Oil-lamps ………………………………………………. When did they open that hospital? - When ………………………………………………………
cho hình vuông ABCD có cạnh AD=3a với a<0, a thuộc R. Tính theo a diện tích xung quanh và thể tích của hình trụ tạo bởi hình vuông ABCD quay quanh đường thẳng MN
CHO $x,y\ge0 và 6xy+2x-3y\ge2$ tìm max $\dfrac{1}{x^2-4x+2}+\dfrac{1}{9y^2+6y+2}$ MONG MỌI NGƯỜI GIÚP ĐỠ
21. My dad gave up _________ (drink) alcohol 3 years ago. 22. We should learn English hard in order to _____________ (study) abroad. 23. Linh ______________ (not come) back yet. 24. Our dads should give up smoking so as to ____________ (live) healthily. 25. So far, we ______________ (be) at home for 3 months. 26. Huy’s mother ______________ (already know) his crush. 27. If I ______(be) you, I would stop littering rubbish. 28. If I were your mom, I ______________ (buy) you a big gift on this Children’s Day. 29. Tam (already know ) _____________ my mother 30. He said that he ( be) ________ a plumber. 31. If I ______(be) a doctor, I would help Covid 19 patients. 32. If she were India’s Prime Minister, she _____________ (order) city lockdown for at least 20 days. 33. While I _________________(run) home, I caught a rain. 34. While she ________________(cook), I ________________(clean) the floor. 35. By the time I got home, my mother ______________(cook) dinner. It’s so wonderful.
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