Cho đoạn thẳng AB = \(2^{10}\) . GỌi M₁ là trung điểm của đoạn thẳng AB; M₂ là trung điểm của đoạn thẳng M₁B ; M₃ là trung điểm của đoạn thẳng M₂B ;..........; Gọi M₁₀là trung điểm của đoạn thẳng M₉₉ B . Tính độ dài của M_{1 và} M₁₀

Ha Long Bay is located in Quang Ninh province. It has many islands and caves. Island is named after the animals around us! In the bay, you can see the island rooster Hens (Hon Trong Mai), even a human head island. You must move the boat around the island - it is really necessary! Tuan Chau is the largest island in Halong Bay, where you can eat a variety of delicious seafood Vietnam. You may see the traditional dances. You can participate in exciting activities. Halong Bay is one the most beautiful natural wonders of Vietnam.

Giả sử tồn tại số tự nhiên a thì số tự nhiên đó có dạng \(21k+7\) và \(84t+3\) (k,t \(\in\) N)

Ta có : a = 21k + 7
và a = 84t + 3 
=> 21k + 7 = 84t + 3 
=> 21k - 84t = -4 
=> 21 ( k - 4t ) = -4 
=> k - 4t = \(-\frac{4}{21}\)
Mâu thuẫn vì tổng các số tự nhiên là số tự nhiên.
Nên điều giả sử là sai 
Vậy không thể tồn tại một số chia cho 21 dư 7 mà chia cho 84 lại dư 3 (đpcm).

Tổng của tất các số nguyên thỏa mãn: \(4< x\le5\)

4. Put the following words in the correct order.

1. I / know / you / hard / this semester / worked / really. _______________________________________

2. this dictionary / he / told / me / him / to / give.

_______________________________________

3. spend / more / you / should / on / English / pronunciation / time. _______________________________________

4. best / to / I'll / do / my / improve / them. _______________________________________

5. spend / on / how much / you / History / time / do? _______________________________________

6. you / should / practise / passages / in / English / reading / aloud. _______________________________________

7. experiments / many / conducted / he. _______________________________________

8. I / learn / how / should / new words? _______________________________________

9. take / physical / should / more / exercise / you. _______________________________________

10. to / to / time / should / come / on / he / class / try. _______________________________________

5. Correct the mistakes in the following sentences, if any.

1. We used to playing marbles much years before.

2. He didn’t used to staying up late night.

3. On the dictionary Friday comes after Wednesday .

4. What do you do yesterday night?

5. We go swimming on the river on last week.

6. My sister is born on 1970.

7. Childs often receivetoys and cakes from Santa Claus on Christmas.

8. They usually get up soon at the morning.

9. How do you often take a nap on noon?

10. It is often rains on summer.

8. Write the following sentences in such a way that the meaningis unchanged, beginning with the words given.

1. What’s his age ? How _______________________________________

2. What is the depth of this lake? How _______________________________________

3. How long is your ruler ? What _______________________________________

4. How heavy is his brother? What _______________________________________

5. This year is 2004 and he is fifteen years old.

He _______________________________________

6. My father is five year older than my mother. My mother _______________________________________

10. The film interested me a lot. I _______________________________________

9. Make questions using the question words given in brackets.

1. They built a new school two years ago. (When?) ____________________________________________________________

2. We ate lunch at the canteen with our friends today. (Where?) ____________________________________________________________

3. They found Mrs. Green's purse under the seat. (Where?) ____________________________________________________________

4. John spoke to the teacher after the lesson. (Who?) ____________________________________________________________

5. My uncle sold his old house last year. (What?) ____________________________________________________________

10. Read the following passage, and then answer the questions. Once upon a time, there was a girl called Cinderella who did all the work in the kitchen while her lazy sisters did nothing. One night her sisters went to a ball at the palace. Cinderella was left at home, feeling very sad. After a time her fairy godmother appeared and told Cinderella that she could go to the ball, but she had to return home by midnight. So she went to the ball in a beautiful dress and a wonderful coach. She danced with the prince, but at midnight she ran back home, leaving one of her shoes on the dance floor. The prince wanted to see her again and went to every house in the capital until he found that the shoe was the right size for Cinderella. The prince and Cinderella were married and lived happily ever after.

1. Where did Cinderella's sisters go one night? _______________________________________________________

2. How was Cinderella when she was left at home? _______________________________________________________

3. Who appeared and helped Cinderella? _______________________________________________________

4. What did Cinderella do at the ball? _______________________________________________________

5. What was the end of the story?

_______________________________________________________

Bài tập tự luận Tiếng Anh lớp 8 Unit 4: Our Past - Ôn tập Tiếng Anh lớp 8 unit 4 - VnDoc.com

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A. đều chịu ảnh hưởng sâu sắc của chiếu Cần vương

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C. đều làm chậm quá trình hoàn thành xâm lược Việt Nam của thực dân Pháp

D. đều thể hiện tinh thần yêu nước của nhân dân