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I lay my love on you
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Nguyễn Tất Đạt
23 tháng 6 2018 lúc 9:19

I call the number of students didn't take part in Mathemas Competition in class A & B are a & b respectively

(with condition: a & b \(\in\)N*)

,From the theme, we have: \(\frac{1}{3}b+a=\frac{1}{5}a+b\)(Because rhe number of students in 2 class is the same)

\(\Leftrightarrow\frac{b}{3}-b+a-\frac{a}{5}=0\Leftrightarrow\left(-\frac{2b}{3}\right)+\frac{4a}{5}=0\)

\(\Leftrightarrow\frac{4a}{5}-\frac{2b}{3}=0\Leftrightarrow\frac{12a-10b}{15}=0\Leftrightarrow12a=10b\)

\(\Rightarrow\frac{a}{b}=\frac{10}{12}=\frac{5}{6}\) 

So the ratio of the number of student didn't take part of Class A & B is \(\frac{5}{6}.\)

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Kenny
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Nguyễn Ngọc Khánh Huyền
1 tháng 12 2021 lúc 6:59

C

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Hoàng Minh Ngọc
1 tháng 12 2021 lúc 8:25

c nha cậu

 

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Lê Quỳnh  Anh
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Dương Hoàn Anh
3 tháng 9 2018 lúc 3:46

Đáp án: A

Giải thích: Câu điều kiện loại 2

Dịch: Lẽ ra chúng tôi đã tham gia cuộc thi nếu giải thưởng lớn hơn chút.

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Nguyễn Trung Dũng
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Nguyễn Trung Dũng
1 tháng 4 2020 lúc 9:17

Giúp mik nhanh nhé mik sắp phải nộp bài rồi

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Đỗ Thanh Hải
15 tháng 9 2021 lúc 18:13

21. “ Can these athletes swim across the river?” Phong asked Ba ……Phong asked Ba if those athletes swam across the river………………………………………………………….………………………….……….. 22. “ Will our class take part in that competition? ” Lam asked Lan …………Lam asked Lan if they class would take part in that competition …………………………………………………….………………………….……….. 23. Her classmate said “ Is Lan the most intelligent girl in our class ?” ………Her classmate asked if Lan was the most intelligent girl in their class…………………………………………………………………………………………… 24. They told us “ Will our friends get the award for their highest scores ?” ………………They asked us if their friends would get the award for their highest scores  ……………………………………………….………………………….………..

25. The teacher said “ Can we collect old books for the poor students” ……………The teacher asked if they could collect old books for the poor student………………………………………………….………………………….………..

26. She asked her mother “ Ought I to wash and iron my own clothes? ” ………She asked her mother if she ought to wash and iron her own clothes……………………………………………………………………………………………. 27. He said to her “ Do you live in this city?” …………He asked her if she lived in that city…………………………………………………….………………………….……….. 28. He said to them “ Do you understand this lesson?” …………He asked them if they understand that lesson…………………………………………………….………………………….………..

29. “ Does Phong’s father work in a hospital? ” Thu asked Ba. ………………Thu asked Ba if Phong's father worked in a hospital……………………………………………….………………………….………..

30. “Does our teacher ask us to clean up the room?” Phong asked Lan ………………Phong asked lan if their teacher asked them to clean up the room………………………………………………………………………….…………

31. “ Do they need some help? ” She asked her husband ………She asked her husband if they needed some help……………………………………………………….………………………….………..

32. “ Do you like reading books?” We asked them ” ………We asked them if……………………………………………………….………………………….……….. 33. “ Do you watch TV every day?” She asked me” ………She asked me if I watched TV everyday……………………………………………………….………………………….……….. 34. “ Does she need some drinks?” I asked him” ……I asked him if he needed some drinks………………………………………………………….………………………….……….. 35. “ Do you play video games in your free time?” I asked her”  ……………I asked her if she played video games in  her free time………………………………………………….………………………….……….. 36. “ Do you enjoy eating noodles?” I asked him. …………I asked him if he enjoyed eating noodles…………………………………………………….………………………….……….. 

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Lê Quỳnh  Anh
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Dương Hoàn Anh
29 tháng 3 2018 lúc 6:47

Đáp án A thành “because of”

Giải thích: Because + mệnh đề và because of + N. Trong câu này sau because là “her sickness” (danh từ) nên ta thay A bằng because of hoặc một cách khác là “due to”.

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Nguyễn Trung Dũng
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Nguyễn Ngọc Linh
1 tháng 4 2020 lúc 7:39

II. Read the text and choose the best options to answer the following questions. This is a story that Charlie Chaplin d to tell about himself. It happened after the great actor had become internationally famous. A theater announced that a competition would be held to see who could act Charlie Chaplin. Those taking part in it had to dress Chaplin, walk Chaplin and act one of the roles in a Charlie’s film. When Charlie Chaplin heard about the competition, he decided to take part in the competition himself. Naturally he kept his plan a secret from everybody. When the results of the comptition were announced, Charlie said: “ I didn’t know whether to feel angry or only surprised. I didn’t win the first prize. But after thinking about it, I decided that it would be best to laugh”.

11. This is a story which ____________

A. was told by his friends.

B. happened even he was not famous yet.

C. Charlie was fond of telling.

D. was announced at the competition.

12. People who took part in the competition had to _______________

A. imitate Chaplin’s walking, dressing and acting.

B. keep a secret from other people.

C. sing a song.

D. be a great actor.

13. Charlin didn’t ________________________

A. take part in the competition.

B. allow this competition to be held.

C. a competition.

D. tell anybody about his plan.

14. When the results of the comptition were announced _________

A. he was very surprised and angry.

B.he learnt that he had won the first prize.

C. he learnt that somebody else had won the first prize.

D. he learnt that his new film was a success.

15. When he learnt the news he decided ________

A. to keep a secret

B. to laugh

C. to be angry

D. not to take part in such a competition

chúc bạn học tốt

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Đặng Quỳnh Ngân
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Đặng Quỳnh Ngân
7 tháng 1 2017 lúc 20:42

Đức Minh

Lan Anh

Phương An

♪ ♀ ♡Băng♥Ciuღ ♂ ♫

Shen

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hoang khanh linh
7 tháng 1 2017 lúc 21:10

bucqua

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hoang khanh linh
7 tháng 1 2017 lúc 21:14

sao tự hỏi tự trả lời thế

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Lê Quỳnh  Anh
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Dương Hoàn Anh
11 tháng 11 2019 lúc 5:16

Đáp án A. because =>because of

Giải thích: Because + mệnh đề trong khi đó because of + N/ V_ing. Vì có his sickness là danh từ nên ta phải dùng because of.

Dịch nghĩa. Vì ốm nên anh ta không tham dự cuộc thi tiếng Anh tổ chức vào thứ sáu tuần trước.

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