Mong các bn làm hộ mình bài này !mình cần gấp !
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NT
0
TD
1
19 tháng 6 2023
a: Tỉ số là 3/2
b: Tỉ số phần trăm là;
40/(30+40+20+20+5)=34,78%
3 tháng 8 2021
Vd7:
b) Ta có: \(\sin^2\widehat{A}+\cos^2\widehat{A}=1\)
\(\Leftrightarrow\sin^2\widehat{A}=1-\dfrac{25}{169}=\dfrac{144}{169}\)
hay \(\sin\widehat{A}=\dfrac{12}{13}\)
\(\Leftrightarrow\cot\widehat{A}=\dfrac{5}{13}:\dfrac{12}{13}=\dfrac{5}{12}\)
\(\Leftrightarrow\tan\widehat{B}=\dfrac{5}{12}\)
DT
Đỗ Thanh Hải
CTVVIP
31 tháng 7 2021
1. Richard feels good than several days ago.
A B C D
2. Mary and Daisy are both intelligent students. Mary is so intelligent as Daisy.
A B C D
3. I found the conversation as most interesting and I was glad to practice my
A B C D
English.
4. The Caspian Sea, a salt lake, is the largest than any other lakes in the
A B C D
world.
5. He drives the car more dangerous than his brother does.
A B C D
6. It was the most biggest building that I had ever seen.
A B C D
7. I wish my house were so large as Jone’s.
A B C D
8. The Mekong is one of the longer river in the world.
A B C D
9. She can play the piano more good than her sister.
A B C D
10. Many people believe that New York is the most great city in America.
A B C D
11. Jessica is only an amateur, but she sings well than most professionals.
A B C D
12. This house is more spacious as that white house I bought in Rapid City,
A B C
South Dakota last year.
D
13. Lan is the more capable of the three girls who have tried out for the part
A B C
in the play.
D
14. This telephone isn’t as cheap the other one, but it work much better.
A B C D
15. Stories are the most good way of teaching moral lessons to young
A B C D
people.
16. The fastest you drive, the greater you get.
A B C D
17. This exercise is much more easier than the others.
A B C D
18. London is much more exciting as I expected.
A B C D
19. The large the room is, more people can sit in it.
A B C D
20. The suitcase seemed to get heavy and heavier as I carried it along the road. A B C D
KY
31 tháng 7 2021
V. Choose the underlined part among A, B, C, or D that needs correcting.
Tìm lỗi sai và sửa lại
1. Richard feels good=>better than several days ago.
A B C D
2. Mary and Daisy are both intelligent students. Mary is so=>as intelligent as Daisy.
A B C D
3. I found the conversation as=>the most interesting and I was glad to practice my
A B C D
English.
4. The Caspian Sea, a salt lake, is the largest =>larger than any other lakes in the
A B C D
world.
5. He drives the car more dangerous=>dangerously than his brother does.
A B C D
6. It was the most =>x biggest building that I had ever seen.
A B C D
7. I wish my house were so=>as large as Jone’s.
A B C D
8. The Mekong is one of the longer=>longest river in the world.
A B C D
9. She can play the piano more good =>better than her sister.
A B C D
10. Many people believe that New York is the most great =>greatest city in America.
A B C D
11. Jessica is only an amateur, but she sings well=>better than most professionals.
A B C D
12. This house is more=>as spacious as that white house I bought in Rapid City,
A B C
South Dakota last year.
D
13. Lan is the more =>most capable of the three girls who have tried out for the part
A B C
in the play.
D
14. This telephone isn’t as cheap=>cheaper than the other one, but it work much better.
A B C D
15. Stories are the most good=>best way of teaching moral lessons to young
A B C D
people.
16. The fastest=>faster you drive, the greater you get.
A B C D
17. This exercise is much more=>x easier than the others.
A B C D
18. London is much more exciting as=>than I expected.
A B C D
19. The large the room is, more=>the more people can sit in it.
A B C D
20. The suitcase seemed to get heavy=>heavier and heavier as I carried it along the road. A B C D
các bn giúp mình bài 2, bài 3.
các bn giúp mình bài 4 và bài 5 nhé. 
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
17 tháng 7 2023
Số bút xanh sau khi bán bằng: 1 - \(\dfrac{1}{4}\) = \(\dfrac{3}{4}\) (số bút xanh lúc đầu)
Số bút tím sau khi nhập bằng: 1 + \(\dfrac{1}{5}\) = \(\dfrac{6}{5}\) (số bút tím lúc đầu)
Theo bài ra ta có: \(\dfrac{3}{4}\) số bút xanh lúc đầu = \(\dfrac{6}{5}\) số bút tím lúc đầu
Tỉ số số bút xanh lúc đầu và bút tím lúc đầu là: \(\dfrac{6}{5}\) : \(\dfrac{3}{4}\) = \(\dfrac{8}{5}\)
Ta có sơ đồ: 
Theo sơ đồ ta có:
Số bút xanh lúc đầu là: 156 : (5 + 8) \(\times\) 8 = 96 (cái)
Số bút tím lúc đầu là 156 - 96 = 60 (cái)
Đáp số:...