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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
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.
VII, Rewrite each of the following sentences, beginning with the given words.
1. What is the length of this river?
- How long is this river?
2. What is the price of this hat?
- How much does this hat cost?
- How much is this hat?
3. What is the price of a cake and an orange?
- How much do a cake and an orange cost?
- How much are a cake and an orange?
4. That book belongs to Nam.
- That is Nam's book.
5. It took her 3 hours to get to the city centre.
- She spent 3 hours getting to the city centre.
Rewrite each of the following sentence in such a way that it means exactly the same as the sentence printed before it. Use the words given and do not change thei form.
1. My father usually drives to work.
- Are there ............................................. ?
2. Phuong has a brother, Nam.
- Phuong is Nam 's younger sister
3. What is the length of the Great Wall ?
- How long is the Great Wall ?
4. There are a lot of flowers in my garden.
- My garden has a lot of flowers
Rewrite each of the following sentence in such a way that it means exactly the same as the sentence printed before it. Use the words given and do not change thei form.
1. My father usually drives to work.
- Are there ( sao sao ay )
2. Phuong has a brother, Nam.
- Phuong is Nam's sister
3. What is the length of the Great Wall ?
- How long long is Great Wall ?
4. There are a lot of flowers in my garden.
- My garden has a lot of flowers
2 . Phuong's brother is Nam
3 . How long is the Great Wall ?
4 . My garden has a lot of flowers
1. Are there your father usually drive to work?
2. Phuong's brother is Nam.
3.How long is the Great Wall?
4. My garden has a lot of flowers.
1. What is the price of these red notebooks?
2. How long have you had it?/ How long have you been having it?
3. How much is a bowl of noodles?
4. How long is the river?
1What is the price of these red notebook?
how long did it take you have it
how much is a bowl of noodles
how long is the river
Read this passage then write True/ False
Nowsday, football becomes one of the world's most popular games. Millions of people play and watch it all around the world
A football match often has two parts. Each part is forty-five minutes. The first part is the first half and the second part is the second half. There is fifteen-minute break between two halve
There are two teams in a football match. Each football team has eleven players, including a goal- keeper. The players on the ground try to kick the ball into the other's goal. The team which scores more goals wins the match
1. ___T___ Today, football becomes very popular all around the world
2. ___T___ Millions of people play football
3. ___T___ A football match has two halves of forty-five minutes each
4. ___F___ There is no break in a football match
5. ___F___ Each football team has eleven players and a goal-keeper in the field
6. ___T___ The winning team in the match is the team which scores more goals
Read this passage then write True/ False
Nowsday, football becomes one of the world's most popular games. Millions of people play and watch it all around the world
A football match often has two parts. Each part is forty-five minutes. The first part is the first half and the second part is the second half. There is fifteen-minute break between two halve
There are two teams in a football match. Each football team has eleven players, including a goal- keeper. The players on the ground try to kick the ball into the other's goal. The team which scores more goals wins the match
1. ___T___ Today, football becomes very popular all around the world
2. ___T___ Millions of people play football
3. ___T___ A football match has two halves of forty-five minutes each
4. ___F___ There is no break in a football match
5. ___T___ Each football team has eleven players and a goal-keeper in the field
6. ____T__ The winning team in the match is the team which scores more goals
Nhanh nhé
Dịch: 2 đoạn dây ruy băng có độ dài bằng nhau. Người ta cắt 2 đoạn ruy băng dài 15 cm từ hai dây ruy băng để làm nút thắt hình con bướm. Tổng độ dài hai dây ruy băng là 60cm.Tính độ dài mỗi đoạn ruy băng?
Giải:
Tổng độ dài của đoạn ruy băng được dùng để làm nút hình con bướm là: 15.2=30 cm
Độ dài của mỗi đoạn ruy băng là: (60 - 30):2=15cm
Vậy độ dài của mỗi đoạn ruy băng là 15cm.
Chúc cậu học tốt!