$x^3$ và $x$ luôn có nghĩa $\forall x$
Vậy hàm số $y=2x^3-4x$ có tập xác định $D=\mathbb{R}$
Đáp án:
$D=R$
Giải thích các bước giải:
$y=2x^3-4x$
Điều kiện xác định : $x\in R$
Vậy $D=R$
Cho 22,6 g hỗn hợp (Mg, Al, Cu) tác dụng với khí Cl2 dư thu được 43,9g muối. Hỏi nếu cho 22,6g hỗn hợp trên tác dụng với O2 dư thu được bao nhiêu gam oxit. giúp mình với gấp
I. Complete the words of school things. 1. t_ _ _ _ _ r 2. d _ _ k 3. r _ l _ r 4. p _ n 5. r _ bb _ r 6. s _ _ _ _ _ t 7. p _ _ _ _ l c_ _ e 8. _ a _ _u _ a _ or 9. b _ _ k 10. ch _ _ r.
Fill in the bank "more" or "less" 1. You should eat ....junk food, or you can put on weight. 2. Watch ......TV, or you will be tired. 3. You should drink .....alcohol. It's not good for your health. 4. You should do .....exercise to keep fit. 5. Wear .......clothes. It's cold outside! 6. You eat too much fried chicken, you should eat .......vegetables. 7. Linh should read ......books. 8. You should drink ...... water to have better skin. 9. You should spend ......time playing video games, or you will have a headache! 10. Wash your hands ......or you will get sick.
phân tích khổ thơ sau = 1 đoạn văn ngắn ( 50 điểm )
Các bạn giúp mình, càng nhanh càng tốt
7. The workers (work) _______________ in the firm at the moment. 8. How many times _________ you (see) ________him since he went to Edinburgh? 9. Rivers usually (flow) __________ to the sea. 10. Look! The boy (cry) _______________. 11. Do you know that man, who (smoke) _______________________ there. 12. Mrs. Green always (go) _____________to work by bus. 13. We (be) ____________ from French. We (be) ______________ there for 20 years. 14. I (move) ______________ to another town next week. 15. I (see) __________ that film several times because I like it. 16. She always (go) _______________ go to bed before her mother does. 17. Mary (lose) _________________ her hat for 2 days. 18. __________you (take) _________ a trip to London next week? 19. She rarely (take) ____________a bath before dinner. 20. He (not finish) _______________ doing it yet. 21. He (not see) ____________ him since Christmas. 22. In what year _______ World War II (break) __________ out? 23. The sun (set) ______________ in the West. 24. They (live) _______________ in Ho Chi Minh City since 1975. 25. He (come) _________ here once 2 years ago. 26. We will go out when it (stop) _________________raining. 27. She (read) ______all the books written by Dickens. How many books _______ you (read) _______? 28. Alice and Mary (put) ___________ the dishes away right now. 29. What ________you (do) _________ at 10 am yesterday? 30. She (finish) ____________ her homework recently. 31. He (just see) ______________ her. 32. They (already show) _______________ the film. 33. I’m sorry the car is not here. I (just sell) ______________ it. 34. When _________you (buy) ________ your bicycle? 35. I (know) ______Jack since we (be) ________ students but I (not meet) ______ him since we (leave) _______ school in 1998. 36. The Bakers (be) ______________ in New York for 3 months. 37. __________you (spend) _________ your holiday in Da lat last summer? 38. We (visit) ___________ that city last year. 39. The farmer (work) _________________ in the field now. 40. John (see) ______________ that film sometimes. 41. My brother (use) ______________ this computer for 2 years. 42. Mr. Green (buy) ______________ a new tractor last month. 43. They (live) ________________ in this street for a long time. 44. My brother (play) _______________ football at the moment. 45. Mr. Green (teach) ______________ French since he left London in 1997. 46. She often (go) _____________ to school by bicycle but yesterday she (go) __________by bus. 47. Look! It (snow) _______________. 48. She (not speak) _________________ to me since last week. 49. Up to now, Hoa (work) _______________ very hard. 50. HCM city (be) ______________ the largest city in Vietnam. 51. They (hold) ________________ the meeting recently. 52. Phong (sleep) _______________ right now
They are both hard-working, but Jane is______more hardworking than Kim. 1 điểm by far one of a bit much 20. This hotel is not as comfortable as that one. 1 điểm This hotel is more comfortable than that one. This hotel is less comfortable than that one. That hotel is less comfortable than this one. That hotel is not as comfortable as this one. 21. This game was the _______exciting game I have ever joined. I was a bit sad. 1 điểm more most less least 22. ________the air is, _________we are. 1 điểm the dirtier- the weaker the more dirty- the more weak the dirtiest- the weakest the most dirty- the most weak 23. It is considered that life in a city is wonderful and________. 1 điểm A. unpleasant B. boring C. enjoyable D. helpful 24. Singapore is one of________in Asia. 1 điểm the cleaner city the cleaner cities the cleanest city the cleanest cities 25. Ann is taking extra lessons to________what she missed while she was sick. 1 điểm A. come up with B. get on well with C. keep up with D. look forward to
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Anh chị ơi giúp em 3 bài tập này với ak><
Mn ơi giúp mình với mình cần gấp để nộp bài c.ơn mn nhìu
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