Cứu mik với ;-;
Tính nhanh:
945 x 239 - 1 / 944 + 945 x 238
Dấu gạch xéo ( / ) là phần nha, đó là phân số á
K
Khách
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PQ
8 tháng 6
1. Tom has been playing the piano for 4 years.
2. I have been cooking for the party for 4 hours.
3. She has been working as a secretary for 2 years.
4. My father has been reading a newspaper for 2 hours.
5. My sister started studying English a year ago.
6. Scientists have been fighting against AIDS since 1980.
7. The Browns began living in London 20 years ago.
8. John started working for this electronics firm in 1999.
9. Women began fighting for their rights since the middle of the 20th century.
10. Jack and Jill started learning to drive 2 weeks ago.
11. When did you start studying English?
12. How long have you been doing research on lung cancer?
13. My grandfather has never been to the hospital before.
14. I have never seen this film before.
15. This is the first time my father has driven a car.
16. It's the first time I've met such a famous singer.
17. It's the first time she has been to the ballet.
18. This is the first time she has drunk Coca Cola.
19. It's the first time I have read this book.
20. It's the first time I have met such an intelligent student.
21. We haven't seen Tom since I moved to Bristol.
22. She hasn't written to me for nearly 2 years.
23. This film was last shown on TV nearly 10 years ago.
24. She last swam in the river 3 years ago.
25. I visited the city museum 5 years ago.
26. I last attended the club in 1988.
27. I last saw him 2 months ago.
28. I last went swimming 2 years ago.
29. I have not played football since 1970.
30. It has not rained for a fortnight.
31. Lucy has not worn that dress since Barbara’s wedding.
32. My father last went to Vung Tau 2 years ago.
33. Betty has not ridden to work for a fortnight.
34. The last time he played tennis was in 1990.
35. The last time I met her was 2 months ago.
36. It’s been over 3 months since Tom had his hair cut.
37. It’s been 2 years since my father went to Hanoi.
38. It’s been years since I enjoyed myself so much.
39. It’s been 2 years since I ate this kind of food.
40. It’s been hours since Mary rang.
41. It’s been 4 years since we saw him.
42. I haven’t gone to see them for over a year.
43. It’s been over ten years since I last played football.
44. She started teaching the children in this remote village five months ago.
45. When was the last time he wrote to you?
46. How long has it been since he last talked to you?
47. I haven’t enjoyed myself since your birthday party.
48. My father hasn’t seen his brother in nearly 20 years.
49. How long is it since you learned to drive?
50. It’s been over six months since John had his hair cut.
SV
Sinh Viên NEU
CTVVIP
9 tháng 6
1.Tom began playing the piano 4 years ago.
àTom has played the piano for 4 years .
2. I started cooking for the party 4 hours ago.
àI have cooked for the party for 4 hours .
3. She started working as a secretary 2 years ago.
àShe has worked as a secretary for 2 years .
4. My father is reading a newspaper. He started 2 hours ago.
àMy father has read a newspaper for 2 years .
5.My sister began to study English a year ago.
àMy sister has studied English for a year .
TH
Thầy Hùng Olm
Manager
VIP
8 tháng 6
Thể tích hình lập phương cạnh 10cm là V1 = 10x10x10 = 1000 (cm3)
Phần thể tích hình lập phương cạnh 20cm ngậm nước là V2 = 20x20x12 = 4800 (cm3)
Vnước + V1 = Sđáy x 10cm (1)
Vnước + V2 = Sđáy x 12cm = Sđáy x 10cm + Sđáy x 2cm (2)
Từ (1) và (2) ta có: Vnước + V2 = Vnước + V1+ Sđáy x 2cm
Sđáy = (V2 – V1): 2 = (4800 – 1000): 2 = 3800: 2 = 1900 (cm3)
Diện tích đáy bể là: 1900cm2
DN
8 tháng 6
có 3 lựa chọn hàng trăm, mỗi lựa chọn hàng trăm có 2 lựa chọn hàng chục, mỗi lựa chọn hàng chục có 1 lựa chọn hàng đơn vị.
vậy cố tất cả số số là:3x2x1=6( số)
DN
8 tháng 6
(n-2x397)=4x250
(n-2-397)=1000
n-2=1000+397
n-2=1397
n=1397+2
n=1399
P
8 tháng 6
Tổng của 5 bao gạo là:
40 + 48 + 60 + 44 + 25 = 217 (kg)
*Sơ đồ số phần bằng nhau sau khi lấy ra 1 bao gạo nếp.
Tổng số phần bằng nhau là: 1 + 3 = 4 (phần)
⇒ Tổng số gạo còn lại ⋮ 4
Do 217 không chia hết cho 4 mà trong 5 bao gạo chỉ có bao 25kg là không chia hết cho 4. Vậy nên ta sẽ thử xem hiệu giữa 217 và 25 có ⋮ 4 không.
Ta có: 217 - 25 = 192
Nhận xét: 192 ⋮ 4.
⇒ Có 1 bao gạo nếp nặng 25kg.
Sau khi lấy ra bao gạo nếp 25kg, ta còn lại: 192kg
Tổng của số bao gạo nếp còn lại là: 192 : 4 = 48 (kg)
Do 40kg là số cân nặng nhỏ nhất nên bao gạo nếp còn lại nặng 48kg. Lúc đầu có số ki-lô-gam gạo nếp là:
25 + 48 = 73 (kg)
Đáp số: 73 kg gạo nếp
NN
1
8 tháng 6
\(1\dfrac{1}{8}=\dfrac{9}{8}=\dfrac{3\times3}{2\times4}=\dfrac{3\times3}{\left(3-1\right)\left(3+1\right)}\)
\(1\dfrac{1}{15}=\dfrac{16}{15}=\dfrac{4\times4}{\left(4-1\right)\times\left(4+1\right)}\)
...
Số thứ 48 là \(\dfrac{\left(3+47\right)\times\left(3+47\right)}{\left(3+47-1\right)\times\left(3+47+1\right)}=\dfrac{50\times50}{49\times51}=\dfrac{2500}{2499}\)
8 tháng 6
\(A=1+\dfrac{1}{3}+\dfrac{1}{6}+...+\dfrac{1}{300}\)
\(=\dfrac{2}{2}+\dfrac{2}{6}+\dfrac{2}{12}+...+\dfrac{2}{600}\)
\(=2\left(\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+...+\dfrac{1}{600}\right)\)
\(=2\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{24}-\dfrac{1}{25}\right)\)
\(=2\times\left(1-\dfrac{1}{25}\right)=2\times\dfrac{24}{25}=\dfrac{48}{25}\)
#include <iostream>
#include <vector>
// Đếm số ước dương của n
int demUoc(int n) {
int dem = 0;
for (int i = 1; i <= n; ++i) {
if (n % i == 0) ++dem;
}
return dem;
}
// Tìm số có nhiều ước nhất
int soNhieuUocNhat(const std::vector<int>& mang) {
int maxUoc = 0, soMax = mang[0];
for (int so : mang) {
int uoc = demUoc(so);
if (uoc > maxUoc) {
maxUoc = uoc;
soMax = so;
}
}
return soMax;
}
int main() {
std::vector<int> mang = {12, 6, 15, 10, 24, 30};
std::cout << "Số có nhiều ước dương nhất: " << soNhieuUocNhat(mang) << std::endl;
return 0;
}