là xấu xấu bẩn bẩn một năm không tắm 

Tìm lỗi sai

1. Does your sister have more or less vacations than you? -> fewer

2. The public library in the city has thousand of good books. -> thousands

3. It takes me about fifteen minutes going to school by bicycle. -> to go

4. Would you like go to the cinema tonight? -> to go

5. You look tired. You'd better staying inside at recess -> stay

6. My sister likes badminton but she doesn't play it very good. -> well

7. Minh enjoys to play volleyball in his free time. -> playing

8. She buys some book from the shop -> books

9. He doesn't usually come house late. -> home

1. Tom and Peter want to visit an ....oceanic..... institute in VN (OCEAN)

2. There are flights ......daily....... from HCM to Nha Trang (DAY)

Hoàn tất doạn hội thoại ,sau đó trả lời các câu hỏi

Mai is at the canteen . she wants some noodles and som coca-cola

Can I .....help...... you?

Yes ....please...... .....I...... ......want...... a bowl of noodles and glass of coca-cola

Here .....you....... ......are....

Thanks . .......How........ ....much..... are they?

x - y - z = 0 => x - z = y ; y - x = -z; z+ y = x

\(B=\frac{x-z}{x}.\frac{y-x}{y}.\frac{z+y}{z}=\frac{y.\left(-z\right).x}{xyz}=\frac{-xyz}{xyz}=-1\)

c) Ta có: \(n^2+3n+7=n\left(n+3\right)+7\)

mà \(n\left(n+3\right)⋮\left(n+3\right)\Rightarrow7⋮\left(n+3\right)\)

\(\Rightarrow\left(n+3\right)\inƯ\left(7\right)\)

hồi trưa mk phải đi học xl bn nha mấy câu còn lại nè

b) Ta có: \(2n-5=2n+2-7\)

mà \(\left(2n+2\right)⋮\left(n+1\right)\Rightarrow7⋮\left(n+1\right)\)

\(\Rightarrow\left(n+1\right)\inƯ\left(7\right)\)

a) Ta có: \(2n+1=2n-4+5\)

mà \(\left(2n-4\right)⋮\left(n-2\right)\Rightarrow5⋮\left(n-2\right)\)

\(\Rightarrow\left(n-2\right)\inƯ\left(5\right)\)

Lưu ý có by nhé bn Cô Chủ Nhỏ

Chuyển các câu sau sang bị động

1.They told me that you were the best architect in this city.

-> I was told that you were the best architect in this city.

2.She reported that the flowers were killed by frost.

-> The flowers were reported to be killed by frost.

3.Some people inform me that the director is going to take a business trip to England.

-> I am informed that the director is going to take a business trip in England.

4.That officer announced that the meeting was delayed until next week.

-> It was announced by that officer that the meeting was delayed until next week.

5.He discovered that this cotton was grown in Egypt.

-> It was discovered that this cotton was grown in Egypt.

6.They promise that the performance will start on time.

-> It is promised that the performance will start on time.

7.He recommends that we should stay at the city center.

-> It is recommended that we should stay at the city center.

8.We believed that Alice would pass the driving test.

-> Alice was believed to pass the driving test./ It was believed that Alice would pass the driving test.

9.The director notifies all the workers that they will have to work extra hard this month.

-> All the workers are notified by the director that they will have to work extra hard this month./ It was notified by the director that all the workers will have to work extra hard this month.

10.They have persuaded me that they will go with me to the stadium.

-> I have been persuaded that they will go with me to the stadium.

11.They have decided that the company will go to the beach together at the weekend

-> It has been decided that the company will go to the beach together at the weekend.

12.People think that Maradona is the best football player in the 20th century.

-> Maradona is thought to be the best football player in the 20th century.

13. They find that the job is not suitable for a girl like her.

-> It is found that the job is not suitable for a girl like her./ The job is found to be not suitable for a girl like her.

14. The teacher explained that this powerful engine pulled the train.

-> It was explained by the teacher that this powerful engine pulled the train.

15.He told me that his football team had played well last season.

-> I was told that his football team had played well last season.

Điểm giống và khác nhau giữa khai thác trắng và khai thác chọn
- Giống nhau: Đều chặt hạ cây rừng.
- Khác nhau: Thời gian chặt hạ, số lần chặt hạ và cách phục hồi rừng.
+ Khai thác trắng là chặt hết cây trong một mùa chặt, sau đó trồng lại rừng.
+ Khai thác chọn là chặt cây theo yêu cầu sử dụng và phù hợp với khả năng tái sinh tự nhiên của rừng.