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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
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.
Make question from the words underline:
1.Phong can drive a car.
what can Phong do?
2.Mr.Nam goes to work by car every day.
how does mr.Nam go to work every day?
3.Affter dinner they often watch TV.
what do they often do after dinner?
4.We must obey the traffic rules.
what must we do?
5.There are some oranges in the basket.
what are there in the basket?
6.Nam's mother wants some eggs.
what does Nam's mother want?
7.Linh has milk and eggs for breakfast.
what does Linh have for breakfast?
8.My father has lunch at home.
where does your father have lunch?
9.Miss Thu likes some cheese
what does Miss. Thu like?
10.Bill í taking two chairs into his room.
what is Bill doing?
1/. There are some fruits in the basket.
2/. Is there any milk to drink?
3/. I needs a dozen eggs.
1. Read the passage and choose the best answer A, B, C or D for each of the questions below.
Basketball involves two teams of five players each. The players score points by throwing a large
round ball into a raised goal called a basket. One basket is at each end of the playing area or court.
Players may move the ball towards the basket only by bouncing it on the floor or passing it to
another team member. Each team also tries to prevent the other team from scoring. The team that
scores the most points is the winner.
Both men and women were playing basketball at schools and sports centers throughout North
America. It became so popular that people started paying money to watch basketball games.
American soldiers took the game to Europe during World War One.
In 1936, basketball became part of the competition at the Olympic Games. About the same time,
college basketball became a major national sport in the United States.
1. How many players are there in a basketball team?
A. There are two players in a basketball team.
B. There are two basketball teams.
C. There are five players in each basketball team.
D. There are ten players in a basketball team.
2. How do the basketball players score points?
A. They kick and throw a ball into a raised goal called a basket.
B. They kick the ball into a basket.
C. They throw the ball into a raised goal called a basket.
D. They throw a ball to the goal in the end of court.
3. Why does each team try to prevent the other team from scoring?
A. They want the other team to score more points.
B. They don’t want the other team to score more points.
C. They want to throw a ball at the other team.
D. They don’t want to score more points.
4. Who were playing basketball in North America?
A. Only American men can play basketball at schools and sport centers.
B. Both American men and women were playing basketball at schools and sport centers.
C. American women can play basketball at schools and sport centers.
D. Young people can play basketball at schools and sport centers.
5. When did basketball become part of the competition at the Olympic Games?
A. In 1936 B. Before 1936 C. In 1956 D. 50 years ago
Complete the second sentence so that it means the same as the first . Use the word in brackets. You do not need to change the word . Write No MORE THAN THREE words .
1.Tell me the number of tomatoes you want .
How __________many tomatoes___________________ do you want ? ( MANY )
2. It's a good idea to bring an umbrella with you . ( SHOULD )
You ___________should bring______________an umbrella with you .
3. There is little spaghetti for both of us .
There is ___________not enough ______________ spaghetti for both of us. ( ENOUGH )
4. In 1010 , Ly Thai To chose Thang Long to be the capital of Viet Nam. ( WAS )
In 1010, Thang Long ___________was chosen by___________ Ly Thai To to be the capital of Viet Nam.
5. We haven't got any eggs .
There are ____________not any eggs left_________ ( LEFT ).
1.Tell me the number of tomatoes you want .
How MANY TOMATOES do you want ? ( MANY )
2. It's a good idea to bring an umbrella with you . ( SHOULD )
You SHOULD BRING an umbrella with you .
3. There is little spaghetti for both of us .
There is NOT ENOUGH spaghetti for both of us. ( ENOUGH )
4. In 1010 , Ly Thai To chose Thang Long to be the capital of Viet Nam. ( WAS )
In 1010, Thang Long WAS CHOSEN BY Ly Thai To to be the capital of Viet Nam.
5. We haven't got any eggs .
There are NOT ANY EGGS LEFT ( LEFT ).
Write the sentences using the words and phrases given
Vietnamese people ofen decorate clean house at Tet.
...............................................................................................................................
The air in the city is more polluted than the air in the country.
...............................................................................................................................
It is very interesting to take a boat trip in the Perfume River.
...............................................................................................................................
My friends and I are playing basket ball at the moment.
...............................................................................................................................
What time do you have breakfast every day?
........................................................................................................................
Write the sentences using the words and phrases given
Vietnamese people/ often/ clean/ decorate/ house/ Tet.
-> Vietnamese people often clean and decorate their houses at Tet..............
The air/ city/ polluted/ air/ country.
-> The air in the city is more polluted than that in the country...........................
It/ very/ interesting/ take/ boat trip/ the Perfume River.
-> It is very interesting to take a boat trip to the Perfume River........................
My friends and I/ play/ basket ball/ at the moment.
-> My friend and I are playing basket ball at the moment......................
What time/ you/ have/ breakfast/ every day?
-> What time do you have breakfast every day?..........................
Basketball involves two teams of five players each. The players score points by throwing a large round ball into a raised goal called a basket. One basket is at each end of the playing area or court. Players may move the ball towards the basket only by bouncing it on the floor or passing it to another team member. Each team also tries to prevent the other team from scoring. The team that scores the most points is the winner.
Both men and women were playing basketball at schools and sports centers throughout North America. It became so popular that people started paying money to watch basketball games. American soldiers took the game to Europe during World War One.
In 1936, basketball became part of the competition at the Olympic Games. About the same time, college basketball became a major national sport in the United States.
1. How many players are there in a basketball team?
A. There are two players in a basketball team.
B. There are two basketball teams.
C. There are five players in each basketball team.
D. There are ten players in a basketball team.
2. How do the basketball players score points?
A. They kick and throw a ball into a raised goal called a basket.
B. They kick the ball into a basket.
C. They throw the ball into a raised goal called a basket.
D. They throw a ball to the goal in the end of court.
3. Why does each team try to prevent the other team from scoring?
A. They want the other team to score more points.
B. They don’t want the other team to score more points.
C. They want to throw a ball at the other team.
D. They don’t want to score more points.
4. Who were playing basketball in North America?
A. Only American men can play basketball at schools and sport centers.
B. Both American men and women were playing basketball at schools and sport centers.
C. American women can play basketball at schools and sport centers.
D. Young people can play basketball at schools and sport centers.
5. When did basketball become part of the competition at the Olympic Games?
A. In 1936 B. Before 1936 C. In 1956 D. 50 years ago
1. How much do those chairs cost?
2. The population ò the world is six bilion people
3. It is a beautiful house
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