100879 + 91872283 = ?
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0L
1
DT
Đỗ Thanh Hải
CTVVIP
21 tháng 9 2021
Bạn ơi, bài ktra bạn ko nên đăng lên hỏi đâu, bạn phải tự làm để giáo viên còn biết để mà giúp bạn chứ, đi thi ai hộ bạn đây
VB
4
4 tháng 12 2021
1. Letters are typed in the office by Mary.
2. You’ll be helped by his father tomorrow.
3. The human life has completely been changed with science and technology.
4. This bottle was broken by Peter.
5. English is being learnt in the room.
6. My mind can’t be changed.
7. I hadn’t been told about it.
8. Her telephone number isn’t known.
9. The children will be brought home by my students.
10. I was sent a present last week.
11. We were given more information.
12. All the workers of the plan were being instructed by the chief engineer.
13. Tea can’t be made with cold water.
14. Some of my books have been taken away.
15. The meeting will be held before May Day.
16. The engine of the car has to be repaired.
17. The window was broken and some pictures were taken away by the boys.
18. A lot of money is spent on advertising every day.
19. A story is going to be told by teacher.
20. A cake is being cut with a sharp knife by Mary.
21. The woman with a red hat was looked at by the children.
22. The victims have been provided with food and clothing.
23. English is spoken in almost every corner of the world.
24. This machine mustn’t be used after 5:30 p.m.
25. After class, the chalk board is always erased by one of the students.
26. Is English taught here?
27. Will she be invited to your wedding party?
28. Has the work been finished by Tom?
29. Were some exercises given by the teacher?
30. Has the window of the laboratory been changed?
Cre: gg
#Jen
4 tháng 12 2021
- 1. Letters are typed in the office by Mary.
- 2. You’ll be helped by his father tomorrow.
- 3. The human life has completely been changed with science and technology.
- 4. This bottle was broken by Peter.
- 5. English is being learnt in the room.
- 6. My mind can’t be changed.
- 7. I hadn’t been told about it.
- 8. Her telephone number isn’t known.
- 9. The children will be brought hnh độ tiếng Anh lớp 4 số 1ome by my students.
- 10. I was sent a present last week.
- 11. We were given more information.
- 12. All the workers of the plan were being instructed by the chief engineer.
- 13. Tea can’t be made with cold water.
- 14. Some of my books have been taken away.
- 15. The meeting will be held before May Day.
- 16. The engine of the car has to be repaired.
- 17. The window was broken and some pictures were taken away by the boys.
- 18. A lot of money is spent on advertising every day.
- 19. A story is going to be told by teacher.
- 20. A cake is being cut with a sharp knife by Mary.
- 21. The woman with a red hat was looked at by the children.
- 22. The victims have been provided with food and clothing.
- 23. English is spoken in almost every corner of the world.
- 24. This machine mustn’t be used after 5:30 p.m.
- 25. After class, the chalk board is always erased by one of the students.
- 26. This dish is brought to me (by the waiter).
- 27. These postcards are sent to us(by our friend).
- 28. This story was told to them(by their grandmother) when they visited her last week.
- 29. This train ket was ordered for Tim's mother.
- 20. The special cameras weren't showed to me.
@sherry
HT~~~(^^)
GS
1
NK
11
15 tháng 2 2016
S hình trụ = S xung quanh + S 2 đáy
- S xung quanh = chiều cao x đáy
- S 2 đáy = S 2 hình tròn
S hình cầu = S hình tròn
23 tháng 4 2020
MC : 32 . 7 = 63
Ta có : \(\frac{3}{7}=\frac{3.9}{7.9}=\frac{27}{63}\)
\(\frac{4}{9}=\frac{4.7}{9.7}=\frac{28}{63}\)
\(\frac{8}{21}=\frac{8.3}{21.3}=\frac{24}{63}\)
Vậy quy đồng các phân số trên ta được \(\frac{27}{63}\); \(\frac{28}{63}\)và \(\frac{24}{63}\).
17 tháng 4 2021
Theo mình nhận định sau là rất đúng và phản ánh được rất trân thực cuộc sống ngày nay.Khi ta đúng ta chẳng phải nổi giận làm gì cả mà thay vào đó ta sẽ vui vẻ, lạc quan và yêu đời hơn nhưng nếu bản thân chúng ta sai ta không có quyền gì để nổi giận vì đó là lựa chọn của chúng ta dù có sai hay đúng vẫn là ý kiến của bản thân và ý kiến sai đó cũng sẽ là một bài học quý để sau này khi phải đối mặt với điều đó ta có thể vượt qua bằng chính những kiến thức mà bản thân đã học tập được.
29 tháng 4 2021
C889:
Áp dụng BĐT Cauchy-Schwars dạng Engel, ta có:
\(\dfrac{x^2}{y}+\dfrac{y^2}{x}\ge\dfrac{\left(x+y\right)^2}{x+y}=\dfrac{4^2}{4}=4\)
Dấu"=" xảy ra khi x=y=2
VT
29 tháng 4 2021
[Toán.C889 _ 29.4.2021]
A= \(\dfrac{\left(x+y\right)\left(x^2-xy+y^2\right)}{xy}\)
=\(\dfrac{4\left(16-3xy\right)}{xy}\)
=\(\dfrac{64}{xy}-12\)
mà xy\(\le\)4
nên \(\dfrac{64}{xy}\ge16\)
vậy A \(\ge\)16-12=4
dấu = xảy ra khi và chỉ khi x=y=2
100879 + 91872283 = 91973162
bằng 91973162