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Có 40 quả trứng chia làm 2 thùng. Nếu chuyển 5 quả trứng từ thùng thứ nhất ra thùng thứ 2 thì thùng thứ 1 sẽ hơn thùng thứ 2 2 quả trứng . Tìm số trứng ở thùng thứ 2 lúc đầu. ( dịch sơ qua thôi )
Bạn tự giải đi . Hihi
Bài 1: First task:
Let \(x\) be the number of sparrows on the first lamp post at first. (\(x\) is a positive integer).
\(\Rightarrow16-x\)is the number of sparrows on the second lamp post at first.
We have: \(x-2+3=16-x+2-3\Leftrightarrow2x=14\Leftrightarrow x=7\)
Hence there are 7 sparrows on the first lamp post at first, 9 sparrows on the second lamp post at first.
Bài 2: Second Task
We can find 2 students who were born on the same day.
There are 30 days in April and 31 students were born on that month. Apply the Dirichlet 's theorem, we can ensure that threre exists at least one day where 2 students were born.
WRITE ONE SUITABLE WORD
Jack London was born in San Francisco, California, in 1876. He took a high place in American literature at the beginning of the twentieth century At that time, the library shelves and bookshops of America were already full of books by famous writers But Jack London's stories were new ones, his were not like the ones in the books of other writers, and the picture he painted weren't the same as their pictures.
Jack London was born in San Francisco, California, in 1876. He took a high place in American literature at the beginning of the twentieth century At that time, the library shelves and bookshops of America were already full of books by famous writers But Jack London's stories were new one, his were not like the ones in the books of other writers, and the picture he painted weren't the same as their pictures.
1 most=>rỗng
2 much=>rỗng
3 to=>rỗng
4 by=>rỗng
5 cards=>rỗng
6 by =>rỗng
7 they=>rỗng
8 there=>rỗng
9 library=>rỗng
10 come=>rỗng
11 lots=>rỗng
(câu 1 là vd bạn nha )
1. Please try to return books to the correct shelf. Thank you.
A Put books back in the correct place.
B Bring books back at the correct time
2. Need to find a room in a hotel? We can book one for you.
A We help people who want to work in a hotel.
B We help people who want to stay in a hotel.
3. Information about bus and train times at this desk only.
A Buy bus and train tickets here
B Find out when to catch a bus or train here
1. It takes me half an hour getting to work.
2. Is this the cheapest computer you have?
3. What is the price of this dictionary?
4. You don't need to finish the work today.
5. The shelf has 20 books.
Ko chắc có đúng ko nữa
Hok tốt!
Circle the correct answer
a/ How often do you go to the library?( In the morning / after lunch/ every afternoon / at 6p.m)
b/ You can find the book with either the author ..........................the title.(and/about/with/or)
c/Math books are kept on the shelves...................the right.(in/at/about/on)
d/Literature and History books are..................the back...........................the library(at-of/in-of/on-of/up-of)
e/ Whose is this English - English dictionary?- It is...................(me's/of mine/mine/my)
Circle the correct answer
a/ How often do you go to the library?( In the morning / after lunch/ every afternoon / at 6p.m)
b/ You can find the book with either the author ..........................the title.(and/about/with/or)
c/Math books are kept on the shelves...................the right.(in/at/about/on)
d/Literature and History books are..................the back...........................the library(at-of/in-of/on-of/up-of)
e/ Whose is this English - English dictionary?- It is...................(me's/of mine/mine/my)
Tìm một từ thừa ở mỗi dòng trong đoạn văn sau.
Good morning and welcome to our library. It's the most 0/ most
largest library in the city. You can find all much kinds of 1/much
books, magazines and newspapers here. To finding a book is 2/ to
very easy. The only thing you can do is to by look in the card 3/ by
index. These cards show the subject and they cards are in 4/ cards
alphabetical order by with both title and author. And now 5/ with
please have a look at shelves. These shelves they on the right 6/they
have there magazines newspapers and dictionaries. Those 7/ library
shelves on the left library have science books and reference 8/ come
books. And those shelves at the comeback of the library have 9/lot
lot history, geography, literature books.
1 much
2 to
3 by
4 cards(từ thứ 2)
5 by
6 they
7 there
8 library
9 come
10 lot
Chúc bạn học giỏi
1. Because I am intereted in the history of television, I’ve read a lot of books about it. (SO)
=> I am ____intereted in the history of television so I’ve read a lot of books about it.___________________________________________________________
2. Ho Chi Minh City is the most crowded city in Viet Nam. (AS)
=> No cities in _____VN is as crowded as Ho Chi Minh City ____________________________________________________
3. Could you tell me the way to the police station? (HOW)
=> Could you tell ___me how to get to the police station ___________________________________________________?
4. I last saw him 2 years ago. (FOR)
=> I haven’t_________seen him for 2 years__________________________________________________
5. I would like to buy 500 grams of sugar. (KILO)
=> I would like to_____buy half a kilo of sugar_____________________________________________
6. We mustn’t throw garbage on the roads. (WRONG)
=> It is_____wrong of us to throw garbage on the roads ________________________________________________________
7. Let’s go out and have an ice cream. (GOING)
=> What about___going out and have an ice cream ____________________________________________________?
8. I began collecting dolls when I was ten years old. (COLLECTED)
=> I have____collected dolls since I was ten years old _______________________________________________________
1. Because I am intereted in the history of television, I’ve read a lot of books about it. (SO)
=> I am intereted in the history of television, so I’ve read a lot of books about it
2. Ho Chi Minh City is the most crowded city in Viet Nam. (AS)
=> No cities in Viet Nam is as crowded as Ho Chi Minh city.
3. Could you tell me the way to the police station? (HOW)
=> Could you tell how to get to the police station?
4. I last saw him 2 years ago. (FOR)
=> I haven’t seen him for 2 years
5. I would like to buy 500 grams of sugar. (KILO)
=> I would like to buy half a kilo of sugar.
6. We mustn’t throw garbage on the roads. (WRONG)
=> It is wrong for us to throw garbage on the roads
7. Let’s go out and have an ice cream. (GOING)
=> What about going and having an ice cream?
8. I began collecting dolls when I was ten years old. (COLLECTED)
=> I have collected dolls since I was ten years old.
Hai kệ sách tất cả chứa 120 cuốn sách .
Chuyển 20 cuốn sách từ kệ thứ nhất sang kệ thứ hai.
Chuyển 30 cuốn sách từ kệ thứ hai sang kệ thứ nhất.
Hai kệ bây giờ có số sách bằng nhau.
Có bao nhiêu cuốn sách trên mỗi kệ lúc đầu?
Giải
Chuyển 20 cuốn sách từ kệ thứ nhất sang kệ thứ hai và chuyển 30 cuốn sách từ kệ thứ hai sang kệ thứ nhất tức là chuyền 10 cuốn sách từ kệ thứ hai sang kệ thứ nhất thì số sách ở hai kệ bằng nhau.
Suy ra lúc đầu kệ thứ hai hơn kệ thứ nhất là : 10+10=20 (cuốn sách)
mà tổng số sách ở hai kệ là 120 cuốn
=> Số sách ở kệ thứ nhất là : (120-20):2=100:2=50 (cuốn)
<=> Số sách ở kệ thứ hai là : 120-50=70(cuốn)
Vậy kệ thứ nhất có 50 cuốn sách và kệ thứ hai có 70 cuốn sách
Hai kệ bây giờ có số sách bằng nhau.
Chuyển 30 cuốn sách từ kệ thứ hai sang kệ thứ nhất.
Chúc bạn học tốt