Mình mới làm bài này xong ^.^

Gọi q là nhiệt lượng cần thiết để cung cấp cho bình tăng thêm 1°C
m(kg) là khối lượng nước nguội suy ra khối lượng nước nóng là 2m(kg)
c là nhiệt dung riêng của nước
Vì nhiệt độ phòng là 25°C nên nhiệt độ ban đầu của nước nguội và bình là 25°C
Nhiệt lượng bình và nước nguội thu vào là :
Q1=cm(70−25)+q(70−25)=45cm+45q
Nhiệt lượng nước nóng tỏa ra là :
Q2=2cm(100−70)=60cm
q=13cm
Gọi ta°C là nhiệt độ cân bằng khi ta đổ lượng nước nóng vào bình mà không chứa gì trong bình
Ta có PT CBN :
2cm(100−ta°C)=q(ta°C−25)
Thay q vào ta có : 2cm(100−ta°C)=13(ta°C−25)
Giải PT ra ta có ta được ≈ 89,3°C

Có gì thắc mắc hỏi mình nha ^.^

Trong sách người ta ghi là: Tầng lớp tư sản ngày càng đông... sau chiến tranh giai cấp tư sản mới ra đời. Mà cô mình đọc là tầng lớp tư sản được chia thành hai bộ phận: TS mại bản với TS dân tộc. Mình đọc phần lý thuyết của diễn đàn cũng nói tương tự vậy, trong khi tầng lớp tư sản đã phát triển thành giai cấp tư sản rồi. Các bạn xem hộ mình nhé!

I. Choose the word whose underlined part is pronounced differently from the others. (0.5 m)

1. A. passed B. watched C. played D. washed

2. A. entrance B. paddy C. bamboo D. banyan

II Identify the underlined word/ phrase (A or B,C,D) that needs correcting to become an exact one(0.5)

1. The teacher said that she would attend the class meeting following day.

A B C D

2. She did her test careful last week.

A B C D

III. Choose the best answer from the four options given (A, B,C, or D) to complete each sentence. (3.0 ms)

1. We have some ……………………….students for the program.

2. We have many well ……………………teachers here.

3. I wish you………………..go camping with us tomorrow.

4. I saw your school’s …………………..in today’s edition of the Vietnam News.

5. If you study at the Brighton Language Center- UK, you …………… in dormitory on campus.

6. My interview is ………… 2 o’clock ………… Monday.

7. Everyone felt tired and hungry, ……………….. they sat down and took a rest.

8. She asked me where I …………………from.

9. What aspects of…………………..English do you find most difficult?

10. Learning a foreign language also includes learning the ……………… of that country.

11. ……………. does it take to get there?

12. My home village is about 30 kilometers …………… to the north of the city.

IV. Fill in each gap with one suitable word. (1.5ms)

Ba’s home village lies near the foot of a (1) ………………. and by a river. Getting to the village is an interesting (2)…………………. People have chance to travel between the green paddy fields, cross a small (3) ……………… forest before they reach a big old (4) ……………… tree at the entrance to the village.

Walking up the mountain, people can visit the (5)………………… of a young Vietnamese hero and enjoy the fresh air there. Besides, they can also take a boat for sightseeing in the river or have a picnic on the (6)………………. It’s a wonderful place for resting.

V. Read the passage, then answer the questions. (1.5ms)

English is a very useful language. If we know English , we can go to any countries we like. We will not find it hard to make people understand what we want to say. English also helps us to learn all kinds of things. Hundred of books are written in English every day in many countries. English has also helped to spread ideas and knowledge subjects all corners of the world. Therefore, the English language has helped to spread better understanding and friendship among countries of the world.

1. What can we do if we know English?

@ ......................................................................................................................

2. What does English help us?

@ ......................................................................................................................

3. Are all of books written in English everyday?

@ ......................................................................................................................

VI. Writing

A Rewrite the following sentences in such a way that it is similar as possible in meaning to the original sentence(1.5 ms)

1. “What is your name?”, Mr. Brown asked me.

@ Mr. Brown asked me ……………………………………………………………

2. I can’t remember the answers to these questions.

@ I wish ……………………………………………………………………………

3. Because Hoa worked hard, she passed the exam.

@ (so) ………………………………………………………………………………

B. Read this advertisement. Write a letter of inquiry to the institution requesting for more information about the course and fee.(1.5 ms)

……………………………………………………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………

…………………………………………………………………………………………

…………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

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……………………………………………………………………………………………

……………………………………………………………………………………………

I. Choose the word whose underlined part is pronounced differently from the others. (0.5 m)

1. A. passed B. watched C. played D. washed

2. A. entrance B. paddy C. bamboo D. banyan

II Identify the underlined word/ phrase (A or B,C,D) that needs correcting to become an exact one(0.5)

1. The teacher said that she would attend the class meeting following day.

A B C D

2. She did her test careful last week.

A B C D

III. Choose the best answer from the four options given (A, B,C, or D) to complete each sentence. (3.0 ms)

1. We have some ……………………….students for the program.

2. We have many well ……………………teachers here.

3. I wish you………………..go camping with us tomorrow.

4. I saw your school’s …………………..in today’s edition of the Vietnam News.

5. If you study at the Brighton Language Center- UK, you …………… in dormitory on campus.

6. My interview is ………… 2 o’clock ………… Monday.

7. Everyone felt tired and hungry, ……………….. they sat down and took a rest.

8. She asked me where I …………………from.

9. What aspects of…………………..English do you find most difficult?

10. Learning a foreign language also includes learning the ……………… of that country.

11. ……………. does it take to get there?

12. My home village is about 30 kilometers …………… to the north of the city.

IV. Fill in each gap with one suitable word. (1.5ms)

Ba’s home village lies near the foot of a (1) ………………. and by a river. Getting to the village is an interesting (2)…………………. People have chance to travel between the green paddy fields, cross a small (3) ……………… forest before they reach a big old (4) ……………… tree at the entrance to the village.

Walking up the mountain, people can visit the (5)………………… of a young Vietnamese hero and enjoy the fresh air there. Besides, they can also take a boat for sightseeing in the river or have a picnic on the (6)………………. It’s a wonderful place for resting.

V. Read the passage, then answer the questions. (1.5ms)

English is a very useful language. If we know English , we can go to any countries we like. We will not find it hard to make people understand what we want to say. English also helps us to learn all kinds of things. Hundred of books are written in English every day in many countries. English has also helped to spread ideas and knowledge subjects all corners of the world. Therefore, the English language has helped to spread better understanding and friendship among countries of the world.

1. What can we do if we know English?

@ ......................................................................................................................

2. What does English help us?

@ ......................................................................................................................

3. Are all of books written in English everyday?

@ ......................................................................................................................

VI. Writing

A Rewrite the following sentences in such a way that it is similar as possible in meaning to the original sentence(1.5 ms)

1. “What is your name?”, Mr. Brown asked me.

@ Mr. Brown asked me ……………………………………………………………

2. I can’t remember the answers to these questions.

@ I wish ……………………………………………………………………………

3. Because Hoa worked hard, she passed the exam.

@ (so) ………………………………………………………………………………

B. Read this advertisement. Write a letter of inquiry to the institution requesting for more information about the course and fee.(1.5 ms)

……………………………………………………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………

…………………………………………………………………………………………

…………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

Câu này của lớp 9 mà!!?