\(1-\frac{4}{1\cdot3}-\frac{4}{3\cdot5}-\frac{4}{5\cdot7}-\cdots-\frac{4}{99\cdot101}\)

\(=1-2\cdot\left(\frac{2}{1\cdot3}+\frac{2}{3\cdot5}+\cdots+\frac{2}{99\cdot101}\right)\)

\(=1-2\cdot\left(\frac11-\frac13+\frac13-\frac15+\cdots+\frac{1}{99}-\frac{1}{101}\right)\)

\(=1-2\cdot\left(\frac11-\frac{1}{101}\right)=1-2\cdot\frac{100}{101}\)

\(=1-\frac{200}{101}=\frac{101}{101}-\frac{200}{101}=-\frac{99}{101}\)

vậy \(B=-\frac{99}{101}\)

Question 1: A. Train
Question 2: A. ruler (điền từ vào câu “I have a new ___”)
Question 3: A. oranges (phát âm “-es” là /ɪz/, còn các từ khác là /s/ hoặc /z/)
Question 4: C. grapes (trọng âm vào âm /s/, không thêm /iz/ như các từ khác)
Question 5: C. island (chữ “s” câm)
Question 6: C. risk (chữ “i” phát âm khác – /ɪ/ thay vì /aɪ/)
Question 7: A. He's playing football.
Question 8: stamps
Question 9: C. whale
Question 10: B. How often
Question 11: shoes (Laura is wearing white shoes.)
Question 12: kites (We like to fly kites on the fields.)
Question 14: C. eggs
Question 15: B. listen (trọng âm rơi vào âm đầu)
Question 16: B. I always drink a cup of tea in the morning.
Question 17: A. one
Question 18: C. two (vil-lage → 2 âm tiết)
Question 19: A. How often
Question 20: A. taller
Question 21: B. We don't usually travel to the countryside.
Question 22: A. Sunday (ngày nghỉ học)
Question 23: A. nurse
Question 24: A. No, he isn’t.
Question 25: B. How
Question 26: B. He is a doctor.
Question 27: D. IW (phát âm giống “wind”)
Question 28: C. rainy (các từ còn lại là danh từ chỉ thiên thể)
Question 29: A. They often go to the cinema on weekends.
Question 30: D. I'd love to.
Question 31: D. often (không phải số thứ tự)
Question 32: B. 1
Question 33: D. doesn't have - has
Question 34: B. It's grapes.
Question 35: A. are (sai – chủ ngữ “Mike” là số ít → phải dùng “is”)
Question 36: B. England (các từ khác là quốc tịch)
Question 37: B. party (các từ còn lại là động từ)
Question 38: D. How do you practice listening English?
Question 39: B. trees
Question 40: A. was
Question 41: C. running
Question 42: D. did (câu trả lời không đầy đủ)
Question 43: D. About 1,000.
Question 44: red
Question 45: rest
Question 46: Close
Question 47: summer
Question 48: up
Question 49: chocolates
Question 50: did
Question 51: Because
Question 52: eggs
Question 53: history
Question 54: monkeys
Question 56: C. the twentieth
Question 60: sisters
Question 61: shoes
Question 64: A. rain
Question 65: D. giant
Question 66: singing
Question 67: B. boat
Question 68: B. Toothbrush
Question 70: scarf
Question 71: D. school bell
Question 72: A. It’s on the fifth of March.
Question 73: C. hospital
Question 74: Do you get up early, Tom?
Question 75: Will you buy a new car?
Question 76: He is from America.
Question 77: The bears have a long sleep in winter.
Question 78: COVID-19 is a dangerous pandemic.
Question 79: What is your school like?
Question 80: I invited some of my friends to my birthday party.
Question 81: Tam Cam is my favourite fairy tale.
Question 82: What subjects do you have on Fridays?
Question 83: Don’t finish all your exercises before you read the keys.
Question 84: My brother usually reads English newspapers and magazines.
Question 85: Would you like to go to the cinema with me tonight?
Question 86: What do you do after having dinner?
Question 87: Hi, this is my brother, Phong.
Question 88: The children can learn a lot of things at school.
Question 89: My penfriend comes from Tay Ninh Province.
Question 90: There is a new and pretty coffee shop in the city center.
Question 91: Listen and repeat.
Question 92: The woodcutter saved the beautiful princess.
Question 93: Quang lives in a city.
Question 94: The calendar is on the wall.
Question 95: I think I will take a boat trip around the islands.
Question 96: Skating is Huong’s favourite activity.
Question 97: I watched my favourite programme after dinner.
Question 98: Do you always go to school in the morning?
Question 99: I watch TV from half past six to half past seven.
Question 100: My house is near a market, so it’s noisy.
Question 101: Pinocchio’s nose grows long when he lies.
Question 102: I’d like to have some yogurt for my breakfast.
Question 103: D. band
Question 104: D. has a shower
Question 105: C. Twice a week

Choose the correct answer

Question 1. A. Underground B. Motorbike C. Train D. Coach

Choose the correct answer

Question 2. I have a new A. pencil B. pen C. ruler D. eraser

Choose the word whose underlined part is pronounced differently from that of the others ⇱

Question 3. A. oranges B. houses C. watches D. goes

Question 4. A. invites B. closes C. grapes D. likes

Question 5. A. summer B. sorry C. island D. seaside

Đề bài là chi bn?

Olm chào em, khi đăng câu hỏi lên diễn đàn Olm, em cần đăng đầy đủ nội dung và yêu cầu, để nhận được sự trợ giúp tốt nhất từ cộng đồng Olm em nhé. Cảm ơn em đã đồng hành cùng Olm. Chúc em học tập hiệu quả và vui vẻ cùng Olm.

Các từ láy:

đẹp đẽ, sạch sẽ, hồng hồng, trăng trắng, thiêu thiếu

đang leo núi thì mệt

dừng lại ăn trưa thì phát hiện ra kho báu

My Story – A Memorable Camping Trip

Last weekend, three close friends decided to go hiking and camping in the mountains. They packed their backpacks with food, water, and camping gear. After a long walk through the forest, they found a beautiful spot and set up their tent near the trees. As the sun began to set, they collected firewood and made a warm campfire.

In the evening, they sat around the fire, shared stories, and cooked delicious food together. The air was fresh, the stars were shining, and everyone felt relaxed and happy. They sang songs, laughed a lot, and took photos to remember the fun moments. It was a great trip, and they promised to go camping again next month.

90 - [120 - (13 - 8)\(^3\)]có phải đề bài như này không, em ơi?

Cô nói rất chính xác !!!

23 + 19 + 1200

= 42 + 1200

= 1242

= 1242

1. D. universe – vũ trụ là tất cả không gian và mọi thứ trong đó

2. C. spaceship – Surveyor I là tàu vũ trụ đầu tiên của Mỹ

3. A. UFOs – hàng xóm thấy vật thể bay không xác định

4. C. gravity – không có trọng lực nên phi hành gia trôi nổi

5. B. habitable – sao Hỏa là hành tinh có thể sống được

6. C. creature – sinh vật kỳ lạ có tóc đỏ và mắt xanh

7. C. UFO – thấy UFO hạ cánh cạnh nhà

8. A. galaxies – dải Ngân Hà là một thiên hà trong vũ trụ

9. D. habitable – tìm hành tinh có thể sống như Trái Đất

10 . D. moon – rất vui khi thấy kính thiên văn hiện đại

11. B. gravity – trọng lực yếu hơn nên nhảy cao hơn

12. A. craters – có thể thấy hố trên mặt trăng bằng kính thiên văn

13. D. Aliens – sinh vật từ hành tinh khác gọi là người ngoài hành tinh

14 A. Sun – Trái Đất quay quanh Mặt Trời

15 D. telescope – cần kính thiên văn để nhìn rõ mặt trăng

1 D

2 C

3 A

4 C

5 B