Để cưa khúc gỗ thành 7 miếng, cần phải cưa 6 lần. Suy ra thời gian để cưa 1 lần là 42 : 6 = 7 (phút)
Để cưa khúc gỗ thành 9 miếng, cần phải cưa 8 lần. Vậy thời gian để cưa khúc gỗ thành 9 miếng là 7 x 8 = 56 (phút) 

k cho mik nha.

Answers: 54 minutes

54 minutes

1. john smokes a lot a year ago, but now he doesn’t smoke any more .

→ john used to smoke a lot

2. it’s time for you to go to school .

→ it’s time you went to shcool

3. how long is it since you saw tom?

→ when Did you last see Tom

4. please keep silent in the classroom.

→ i’d rather you kept silent in the classroom

5. he can’t pass the examination.

→ he wishes he could pass the examination

Dịch:

Phải mất Mr Jackson 5 phút để cắt một phần đăng nhập thành một nửa. Mất bao lâu để anh ta cắt cùng một phần đăng nhập thành bốn mảnh bằng nhau?

Solution

The time he takes to chop the same piece of log into a piece is:

5.00 : 2 = 2.30

The time he takes to chop the same piece of log into four equal pieces is:

2.30 x 4 = 10.00

Answer: 10.00

Viết lại câu không thau đổi nghĩa
1. He began to give up smoking last year.
-> he has given up smoking since last year
2. They began to Hue in Ho Chỉ Minh City in 2000.
->they have been to Hue in Ho Chỉ Minh City since 2000
3.He started to leam how to plạy the piano in 2005,
->He has learnt how to plạy the piano since 2005
4. When did you start learning English?
->How long have you learnt E ?
5. How long bave you learnt English? ,
->When did you start learning English
6. When dịd you first know Mrayam?
->How long is it since you first knew Mrayam?
7. When did people first use the telephone?
->How long is it since people first used the telephone?
8. When did you start saving money?
->How long have you saved money ?
9. The last time I wrote to hẹr was two years ago.
->I haven"t written to her for two years
10. I hasn't rained for two months.
->The last time it rained was two months ago
11.I last talked to her in 2004.
->l haven't talked to her since 2004
12.It has been a long time since Lan left her school.
-> Lan has left her school for a long time
13. He hasn"t Written to me for two months,
->it has been two months since he wrote to me
14, She last heard that song three years ago.
->It's three years since I last heard that song
15.. It's two yesrs since I saw hẹr.
-> I haven't seen her for two years
16. It's ten years since Nam stopped playing the piano.
->Mary hasn't played the piano for ten years
17. Mary was last seen 20 minutes ago.
->Mary hasn't seen for 20 minutes
18.The last time I saw David was in 1995
->I haven't seen David since 1995
19.We haven't been to a concert for over a year.
->The last time we were to a concert was over a year ago
20.Your birthday party was the last time I really enjoyed myself
->I haven't enjoyed myself since your birthday party
3.It's nearly 20 years since my father saw his brother.
->My father hasn't seen his brother for nearly 20 years
4.Tom went to Scotland last Friday and is still there.
->Tom has gone to Scotland since Friday and is still there.
5.When did you last ride a bike?
->How long is it since you last rode a bike?
6.The last time I went swimming was when I was in France
->I haven't gone swimming since I was in France
7.You haven't tidied up this room for weeks.
->It's weeks since you tidied up this room
8.He was last in touch with me there weeks ago.
-> He hasn't touched with me for three weeks
9.Mr John hasn't visited France since 1990

The last time Mr John visited France was in 1990

#Yumi

1. Ba bí ngô được cân nặng theo cặp trong tất cả các cách có thể. Các trọng số của tất cả các cặp là 8kg, 9kg và 11kg. Bao nhiêu trọng lượng bí ngô nhẹ nhất?
2. Phải mất Jack phút 42 để cắt một khúc gỗ dài của gỗ thành bảy miếng. nó sẽ đưa anh ta bao lâu để cắt mà log gỗ thành chín miếng?
3. Tổng của hai phân số 1/2 và 1/3 là một phần nhỏ với mẫu số của 12. Tìm tử số của nó
4. Các sàn của một căn phòng hình chữ nhật được bao phủ với gạch vuông. Các phòng dài 24 gạch và rộng 16 gạch. Số gạch ở biên giới phía ngoài của tầng này là?
5. trung bình 4, 8, X và 13 là 8. Giá trị của X là?
6. Có bao nhiêu chữ số 0 ở đó trong mười triệu?
7. Điền số còn thiếu vào chỗ trống
44.444 = 40000 +400+ ............ + 4
8. Có 3 trẻ em trong một gia đình, Jack, Đức Maria và Peter.Mary có thể làm sạch nhà trong 1 giờ .Jack có thể làm cùng một công việc trong 2 giờ và Peter cần 6 giờ. Nếu họ thực hiện công việc với nhau sau đó họ cần phút ............
9.MNPQ là một hình vuông được tạo thành từ hai hình chữ nhật giống hệt nhau và hai hình vuông của khu vực 9 và 16CM2. Diện tích của hình vuông MNPQ là? CM2

1. là 3

2. là 54

VIII. Rewrite the sentences.

1. John smoked a lot a year ago, but now he doesn’t smoke any more. àJohn used TO SMOKE A LOT 

2. It’s time for you to go to school. à  It’s time you WENT TO SCHOOL

3. How long is it since yu saw Tom? à When DID YOU SEE TOM?

4. please keep silent in the classroom. à I’d rather you KEPT SILENT IN THE CLASSROOM

5. He can’t pass the examination. à  He wishes HE COULD PASS THE EXAMINATION

6. We can’t go out because of heavy rain. à We wish WE COULD GO OUT

7. I don’t like you to come to class late. à  I’d rather you DIDN'T COME TO CLASS LATE

8. What a pity! He can’t come here. à I wish HE COULD COME HERE

9. They often went to Vung Tau at weekends. à They used TO GO TO VT AT WEEKENDS

10. Maryam and Lan have been pen pals for over 2 years. à Maryam and Lan have written WITH EACH OTHER FOR OVER 2 YEARS

VIII. Rewrite the sentences.

1. John smoked a lot a year ago, but now he doesn’t smoke any more. àJohn used  to smoke a lots a year ago.

2. It’s time for you to go to school. à  It’s time you  went to school

3. How long is it since yu saw Tom? à When  did you last see Tom ?

4. please keep silent in the classroom. à I’d rather you  kept silent in the classroom

5. He can’t pass the examination. à  He wishes  he could pass the examination.

6. We can’t go out because of heavy rain. à We wish  it didn't rain so heavily that we could go out.

7. I don’t like you to come to class late. à  I’d rather you

8. What a pity! He can’t come here. à I wish  didn’t come to class late.

9. They often went to Vung Tau at weekends. à They used to go to Vung tau at weekends.

10. Maryam and Lan have been pen pals for over 2 years. à Maryam and Lan have written  to each other for over two years. 

1.How long is it since you saw Tom?
When........did you see tom?.............
2. He can't pass the examination.
He wishes.....he could pass the examination...........
3. We can't go out because of heavy rain.
They wish.....it didn't rain heavily .........
4. They often go to Vung Tau at the weekends.
They used.....to go to Vung Tau at the weekends..........
5. How long have you learnt French?
How long ago......did you learn french?.......
6. My father started to give up smoking last year.
My father......has given up smoking since last year...........
7. They have worked in that factory since 2001.
They started......working in that factory in 2001.....
8. I haven't seen her for a long time.
I didn't.....see her a long time ago ..............

It is 2 years since Ba last met his old teacher

The last time he wrote to him was 2 months ago

watched a soccer match on TV for 20 minutes

have you known this bamboo forest?

My name is Peter and my day usually begins at six thirty. I get up and do some morning exercises for about fifteen minutes. Then I take my shower. After that I get dressed and have breakfast with my family. I usually have a light breakfast with bread and eggs. At seven thirty I leave for school. I generally take the bus to school. It takes about twenty minutes to get to school. My first class is at half past eight and I usually finish school at three. Sometimes I stay late to have a game of volleyball or work in the library. I usually reach home at around four o’ clock. When I get home I like to watch TV for a moment. Then I start my homework. I have dinner at seven o’clock . After that I often have more homework to do. Sometimes I watch TV or go out with my friends after dinner. I often go to bed at about a quarter to eleven.
Questions:
1. What time does Peter’s day usually begin?

at six thirty.

2. How does he have breakfast with?

HE usually hAS a light breakfast with bread and eggs.

3. How does he go to school ?

by bus

4.How long does it take him to get to school?

It takes about twenty minutes to get to school.

5. When is his firts class?

at half past eight

6. What time does he usually finish school ?

at three.

7.Why does he sometimes stay late?

to have a game of volleyball or work in the library.

8. Does he come home at six o'clock?

no, he doesn't

9. What does he do when he gets home?

he watches TV for a moment.

10.What does he sometimes do after dinner?

he often does his homework

My name is Peter and my day usually begins at six thirty. I get up and do some morning exercises for about fifteen minutes. Then I take my shower. After that I get dressed and have breakfast with my family. I usually have a light breakfast with bread and eggs. At seven thirty I leave for school. I generally take the bus to school. It takes about twenty minutes to get to school. My first class is at half past eight and I usually finish school at three. Sometimes I stay late to have a game of volleyball or work in the library. I usually reach home at around four o’ clock. When I get home I like to watch TV for a moment. Then I start my homework. I have dinner at seven o’clock . After that I often go to bed at about a quarter to eleven.
Questions:
1. What time does Peter’s day usually begin?

His day usually begins at six thirty.

2. How does he have breakfast with?

He has a light breakfast with bread and eggs.

3. How does he go to school ?

He goes to school by bus.

4.How long does it take him to get to school?

It takes him about twenty minutes to get to school.

5. When is his firts class?

His first class is at half past eight .

6. What time does he usually finish school ?

He usually finishes school at three.

7.Why does he sometimes stay late?

Because he has a game of volleyball or work in the library.

8. Does he come home at six o'clock?

No, he doesn't.

9. What does he do when he gets home?

He watches TV for a moment when he gets home.

10.What does he sometimes do after dinner?

He sometimes watches Tv or goes out with his friends after dinner.