230-229+228-227+.......-23+22
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KJ
1
15 tháng 12 2021
\(2A=2-2^2+2^3-...-2^{30}+2^{31}\\ \Leftrightarrow2A+A=2-2^2+2^3-...-2^{30}+2^{31}+1-2+2^2-...-2^{29}+2^{30}\\ \Leftrightarrow3A=2^{31}+1\\ \Leftrightarrow A=\dfrac{2^{31}+1}{2}\)
22 tháng 12 2020
đâu phải chọn abc j đâu. mấy cái này là câu hỏi hết mà=/
14 tháng 1 2021
Đổi thành Câu hỏi đuôi
17, Bill couldn’t have prevented it
=> Bill couldn’t have prevented it, could he?
18, Bill hasn’t got a car
=> Bill hasn’t got a car, has he?
19, there weren’t any mosquitoes
=> There weren’t any mosquitoes, were there?
20, George hadn’t been there before
=> George hadn’t been there before, had he?
21, you would’t mind helping me with this
=> You would’t mind helping me with this, would you?
22, you take sugar in tea
=> you take sugar in tea, don't you?
23, but you don’t take it in coffee
=> But you don’t take it in coffee, do you?
24, it never works very well
=> It never works very well, does it?
14 tháng 1 2021
Chào em, em tham khảo nhé!
17. Bill couldn't have prevented it, could he?
18. Bill hasn't got a car, has he?
19. There weren't any mosquitoes, were there?
20. George hadn't been there before, had he?
21. You wouldn't mind helping me with this, would you?
22. You take sugar in tea, don't you?
23. But you don't take it in coffee, do you?
24. It never works very well, does it?
25. Mary hardly ever cooks, does she?
26. She'd save money if she bought fresh food, didn't she?
27. Neither of them offered to help you, did they?
28. He hardly ever leaves the house, does he?
29. Nothing went wrong, did they?
30. There used to be trees here, didn't there?
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CM
19 tháng 2 2019
Đáp án cần chọn là: A
Từ đề bài, ta thấy các số tự nhiên lớn hơn hoặc bằng 228 và nhỏ hơn hoặc bằng 230 là
228;229;230.
Mà a<b<cnên ta có a=228;b=229;c=230.
KR
4 tháng 8 2021
1. do / you / how / learn / vocabulary _____How do you learn vocabulary___?
2. how / speaking / you / practise / do _____How do you practise speaking____?
3. do / you / reading / practise / how ____How do you practise reading______?
4. English / learn / do / why / you _____Why do you learn English____?
LH
4 tháng 8 2021
1.How do you learn vocabulary 2. How do you practise speaking 3.How do you practise reading 4.why do you learn English
Đặt A=230-229+228-227+...-23+22
2A=231-230+229+228+....-24+23
2A + A = 231 + 22
3A = 231+22
A = (231+22) / 3