Đáp án:
\(x \ne \left\{ {0;\dfrac{1}{2}} \right\}\)
Giải thích các bước giải:
\(\begin{array}{l} - \dfrac{{{{\left( {2x - 1} \right)}^2}}}{{{x^2}}} < 0\\ \to \dfrac{{{{\left( {2x - 1} \right)}^2}}}{{{x^2}}} > 0\\ \Leftrightarrow \left\{ \begin{array}{l}2x - 1 \ne 0\\{x^2} \ne 0\end{array} \right.\\ \to \left\{ \begin{array}{l}x \ne \dfrac{1}{2}\\x \ne 0\end{array} \right.\\ \to x \ne \left\{ {0;\dfrac{1}{2}} \right\}\end{array}\)
Đây là bất phương trình not bất đẳng thức :V
$\frac{-(2x-1)^2}{x^2}<0$ Đk: $x \neq 0 ;x \neq \frac{1}{2} $
$⇔\frac{(2x-1)^2}{x^2}>0$
$⇔\left \{ {{(2x-1)^2>0} \atop {x^2>0}} \right.$
$⇔\left \{ {{x>\frac{1}{2} } \atop {x>0}} \right.$
$⇒x>\frac{1}{2} $
Tìm tất cả các giá trị thực của m để hàm số y= 2x-3m-2 / x-m nghịch biến trên khoảng (1;2)
Bạn nào giải giúp mình với, mình cảm ơn nhìu :)))
một vật rắn khi cân ngoài không khí và cân trong dầu nó gimar đi 22g còn khi trong nuowcs giảm 26g tính trọng lượng riêng của dầu
Fill in the blanks with the correct prepositions 1. Does your father work ___________________ Hanoi? 2. What do you do ___________________ your free time? 3. Lan will have a party ___________________ Friday evening. 4. David is good ___________________ Math. 5. Are you interested ___________________ sports? 6. There's a good film ___________________ the moment. 7. Would you like to come ____________ my house ____________ lunch? 8. Thanks _____________ your letter. 9. I'll see my mom and dad _____________ their farm. 10. We have to work hard _____________ home and ____________ school. 11. She takes care _____________ her family. 12. He works _____________ a factory. 13. We always go to Ha Long Bay _____________ vacation. 14. Tell me more ___________________ your family. 15. Can you send me a photo ___________________ your family? 16. She works ___________________ a local supermarket. 17. He goes _____________ the city _____________ his wife. 18. It takes 18 hours to get _____________ Hanoi _____________ coach. 19. We write _____________ each other twice a week. 20. My mother works _____________ the field _____________ my father. 21. We'll visit her _____________ Christmas. 22. Are you tired _____________ watching TV? 23. She always brings notebooks _____________ school. 24. He is the president _____________ our club. 25. She spends most __________ the time _________ the couch ________ front ________ the TV. 26. What do you usually do _____________ school? 27. Why don't you come _____________ ? 28. They swap cards _____________ their friends. 29. Will you play a game _____________ us? 30. What do you do _____________ recess? 31. They usually have portable CD player _____________ small earphones. 32. I'll take part _____________ your club. 33. They read or study _____________ the same time. 34. We enjoy all _____________ our classes. 35. _____________school, we study many things. 36. _____ history, we study past and present events _________ Vietnam and _________ the world. 37. _____________ physics, we learn _____________ how things work. 38. She learns how to use a computer _____________ her Computer Science class. 39. Newspapers are _____________ the racks _____________ the middle. 40. Math books are _____________ the shelves _____________ the left. 41. The largest library is _____________ Washington D.C, the capital _____________ the USA. 42. Those books _____________ the back ____________ the libraries are ___________ English. 43. Now, come and look _____________ the kitchen. 44. My uncle is _____________ work now. 45. Can I see the rest _____________ the house? 46. The computer isn’t working. It broke ____________ this morning. 47. The plane took _______________ very quickly 48. His opinion is different ______________ mine. 49. I’m not interested _______________ politics. 50. She was very angry _______________Tom. Giúp em với ạ hơi nhiều nên cố giúp em nha em cám ơn anh chị
làmmm nhanhh giúppp mình vớiiii!!!!!!
Trả lời 1 bài sau (15 câu) ' (không ghi lại câu hỏi) ' Finish the second sentence in such a way that it means the same as the sentenceprinted before. 1. I accomplished this task in three months. → It took ....................................................................................... 2. The café has a lot of tables. → There ...................................................................................... 3. New York has more billionaires than Tokyo. → Tokyo ...................................................................................... 4. Mr Lam lived in the country when he was a child. → Mr. Lam used ...................................................................................... 5. You forgot to turn off the T.V last night, didn't you? → You didn't remember ......................................................................................? 6. Is there a colorful picture in your room? → Does ......................................................................................? 7. Peter is the best at English in his class. → Nobody ...................................................................................... 8. Let’s have a picnic in the park on the weekend. → Why ...................................................................................... 9.. My house is near the supermarket. → My house is not ...................................................................................... 10. How much are these red notebooks? → What ......................................................................................? 11. It was an interesting film. → What ...................................................................................... 12. What’s the weight of your suitcase? → How ...................................................................................... 13. She knows more about it than I do. → I don’t ...................................................................................... 14. It was such a good weather that we went swimming. The weather ...................................................................................... 15. I’m always nervous when I face a lot of people. Facing ......................................................................................
lớp 10A có 40 học sinh, trong đó có 18 hs giỏi toán,17 hs giỏi văn, 20 hs giỏi anh, 8 hs giỏi toán và văn, 10 hs giỏi văn và anh, 13 hs giỏi toán và anh, 6 hs giỏi văn toán anh.Hỏi có bao nhiêu học sinh giỏ chỉ 1 môn
mong mn có thể giúp mình bài này với ạ ??
. Choose the best answer. 1. She was very surprised________ the grade she received. A. at B. on C. of D. about 2. We might need more food, depending____ how many people turn up. A. for B. on C. at D. with 3. Jane doesn't spend much money______ clothes. A. over B. about C. at D. on 4. She always takes good care_______ her children. A. for B. in C. of D. with 5. I was disappointed________ the grade I received on my last essay. A. for B. about C. to D. A and B 6. We went there_______ car and stayed there for the whole day. A. in B. on C. with D. by 7. He always prevents me ___________doing my duty. A. of B. from C. with D. against 8. I write letters _______ my right hand. A in B. by C. with D. at 9. She is absent_______ class A. at B. from C. to D. away 10. It is very nice______ you to take so much trouble. A. of B. to C. for D. from. Giúp em với ạ
Cho tâm giác vuông tại A. Từ điểm E trên cạnh BC.vẽ đường thẳng vuông góc vs BC cắt cạnh AC tại D Chứng minh : góc EDC= góc B (MN TỰ VẼ HÌNH Ạ)
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
