Đáp án:
`A<B`
Giải thích các bước giải:
`A=(2+1)(2²+1)(2^4+1)`
`=1.(2+1)(2²+1)(2^4+1)`
`=(2-1)(2+1)(2²+1)(2^4+1)`
`=(2²-1)(2²+1)(2^4+1)`
`=[(2^2)^2-1^2](2^4+1)`
`=(2^4-1)(2^4+1)`
`=(2^4)^2-1^2`
`=2^8-1`
Ta có:`2^8-1<2^8`
`⇒(2+1)(2²+1)(2^4+1)<2^8`
`⇒A<B`
Vậy `A<B`
`A =( 2 + 1) ( 2^2 + 1) ( 2^4 + 1)`
`=3( 2^2 + 1) ( 2^4 + 1)`
`=(4 - 1)( 2^2 + 1) ( 2^4 + 1)`
`=(2^2 - 1)( 2^2 + 1) ( 2^4 + 1)`
`=(2^4 - 1) ( 2^4 + 1)`
`=2^8 - 1`
(Áp dụng hằng đẳng thức số 3 nhá)
`0 > - 1`
`⇒ 0 + 2^8 > - 1 + 2^8`
`⇒ 2^8 >2^8 - 1 `
hay `B > A`
Sao lại thành ra như thế này, tui đã quyết là sẽ bỏ nick này rồi mà :(( Đề: Vẽ anime vui :)
cos(2x+pi/4)=-1/3 Giải giúp mình với
Mọi người ơi giúp e vơi ạ :> 1. She (go)……………. to school everyday. 2. There (be)………… big problems in many parts of the world. 3. A lot of people (go)………………..to work by car. 4. Davis never (not/take) …………………..the bus to school. 5. He plays volleyball but he (not/enjoy)…………………………..it. 6. Most shops usually (open)…..…… at 8.00 a.m and (close) ………at 6.00 p.m. 7. School children (wear)…………… uniform on Monday. 8. I want ( buy)……………………some stamps. 9. Ruth (live)………………. with his parents in an apartment. 10. He (visit)…………….his parents next week. 11. Lan often (go) ………………. to school on foot? 12. She ……………….(go) to school everyday. 13. Bad students never (work) ……………….hard. 14. The teacher always (point) ……………….at the black – board when he wants (explain) …………..……….something. 15. Her mother always (cook) ………….in the morning? 16. My father (call)………….…..you in 10 minutes. 17. He (meet) ………………….…….. the dentist next week. 18. They usually (not/go) ……………..…..……. to school by motorbike. 19. She (come) ……………..here next month. 20. They (not/be) ……………….. doctors. 21. He often (get) ……………………… up late. 22. You often (watch) …………….TV? 23. His children always (be)……..………….at home. 24. Hai often (wash) ……………………his face at 6.15. 25. Thanh and Mai always (see) ……………………a movie on Saturday. 26. He often (take) ……………………a bus to school? 27. The people (be) ……………students in class 8A. 28. Do you fancy (go)………………out tomorrow? 29. She (go) ……………………to work by bus tomorrow. 30. You (be) ……………………at home tomorrow morning? 31. They sometime(do) …………………morning exercises at 5. 32. Where they (plant) ……………trees next month? 33. Hung (run) …………………about 5 km every morning. 34. He (write) ……………………to his friend next week. 35. Mai and Nam (go) ……………………to the movie theater tomorrow evening. 36. I often (not/wash) ………………my clothes. 37. He often (pick) ………………his friend up at the rain way station morning. 38. What time they(talk) ………………to each other? 39. The sun (rise) …………in the East and (set) …………. in the West. 40. Where she (buy)……………her breakfast every morning? 41. Ngoc (love)…………. cartoons, but she says she (not/continue)…………….. this hobby in the future. 42. There (be)…………………a lot of milk in the bottle. 43. You (do)……………. morning exercise every day? 44. Hoa still (play)………………… badminton next year? 45. My dad loves (go)…………….to football games. 46. I think 10 years from now more people (enjoy)………………. gardening. 47. What your brother (do)………………… in his free time? 48. Tung’s never liked (swim)………………….. 49. If it rains, we (stay)……………..at home. 50. My friend (not/mind)……………..cooking.
câu 1 : cho CT : y-3 =x ; -2y =x ; y mũ 2 =y CT nào là H /số của x câu 2: y= 15 trên 2x-4 . tìm điều kiện của x để VP có nghĩa câu 3 cho y bằng x mũ 2 +3x + 2x . tính y (-1) ; y(0) ; y (1 phần 2 ) câu 4 cho y =f(x)= ax nhân CMR a. với x1 ; x2 bất kì ta có f (x1+x2) =f(x1) + f(x2) b. với mọi K thuộc Q LÀ (KX) = k nhân f (x)
tại sao châu mĩ có nhiều thành phần da
vẽ tranh về chủ đề an toàn giao thông nhó ! p/s: đơn giản mà vẫn đẹp thôi nhé mn, ko cần cầu kì quá đouu
29. Her appearance is ………………………… today. She shouldn’t come. (need) 30. They are living in a ………………………… decorated house. (beauty) 31. A person who is interested in conservation is a …………………………. (conserve) 32. There are a lot of technological ………………………… designed to save energy. (innovate) 33. This man …………………………in writing (success) 34. She always ………………………… listens to what she is told. (attention)
Writing/ write a paragraph about ways to make the school a "greener" place. (200-300 words)
ai nhanh 5 sao và 1 câu trả lời hay
Cho 6 gam kẽm hạt vào một cốc đựng 150 ml dung dịch HCl 2M (dư) ở nhiệt độ thường. Nếu giữ nguyên các điều kiện khác, chỉ thay đổi một trong các điều kiện sau đây thì tốc độ phản ứng sẽ tăng khi
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