Dãy số nào sau đây là cấp số nhân?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
- Dãy số ở đáp án A có dạng $u_{n+1} = q.u_n$ với $q = -\sqrt{2}$. Vậy đây là cấp số nhân.
- Các dãy số ở đáp án B, C, D không phải là cấp số nhân vì không có công bội không đổi.
Câu hỏi liên quan
Phương tiện giao tiếp phi ngôn ngữ là gì?
Hoạ sĩ thiết kế một micro có dạng khối tròn xoay, mặt cắt đứng chứa trục của khối tròn xoay có dạng như hình sau, trong đó \({\rm{OA}} = {\rm{OB}} = {\rm{OI}} = 2\;{\rm{cm}}\), \({\rm{MC}} = {\rm{MD}} = 1\;{\rm{cm}}\), đường thẳng OM là đường trung trực của đoạn thẳng CD, \({\rm{OM}} = 20\;{\rm{cm}},\widehat {{\rm{AOB}}} = {90^o }.\) Thể tích của micro này là bao nhiêu \({\rm{c}}{{\rm{m}}^3}\) ? (Làm tròn kết quả đến hàng đơn vị)
Đặc điểm nào sau đây đúng với vùng đồng bằng ven biển Việt Nam?
Bộ phận nào trong máy tính được gọi là "bộ não" vì nó điều khiển mọi hoạt động xử lý?
Read the following advertisement and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 1 to 6.
Humanitarian Imprints: Inspiring Stories Shaping 2025
Be Inspired. Take Action. Make Change.
Do you want to discover how ordinary people create extraordinary change in difficult global situations? The global (1)_________ conference will showcase amazing success stories from around the world. Join us for this life-changing experience!
Our passionate (2)_________ need your generous support to continue their vital mission abroad.
Meet brave volunteers (3)_________ communities recover from devastating natural disasters throughout developing countries. Our organization sends essential supplies (4)_________ affected populations during emergencies.
Let's (5)_________ it, we all have the power to change someone's life for the better every single day. We invite you to join our growing movement and start (6)_________ a meaningful difference in local communities today!
When: May 20-22, 2025
Where: Central Exhibition Hall
Time: 9:00 AM - 7:00 PM
Entry: Free admission
Contact us: info@humanitarianimprints.org | 555-789-0123
Together, we can build a better world!
Hiện tượng nào là hệ quả chuyển động tự quay quanh trục của Trái Đất?
Điền các dữ kiện còn thiếu để hoàn thành bảng sau:
Tên nguuyên tố Số p Số n Kí hiệu nguyên tử carbon 612C 1123Na 2656Fe Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 1 to 5.
The process of sorting through the various holidays on offer and determining which is the best for you is inevitably complex and individual personality traits will determine the eventual decision. Some people undertake a Other process of extensive problem solving, in which information is sought about a series of products, (1) _________ . Other consumers with no patience to explore a variety of choices (2) _________ , for the sake of their convenience rather than trying to guarantee that they buy the best possible product. This is known as limited problem solving.
Many consumers engage in routinised response behaviour, in which choices change relatively little over time. (3) _________ . Also, some holidaymakers who have been content with a particular company or destination in the past may opt for the same experience again.
Finally, some consumers will buy on impulse. (4) _________ . It is, in fact, a pattern of behaviour that is becoming increasingly prevalent -- to the dismay of the operators, who then have less scope for forward planning and reduced opportunities to gain from investing deposits in the short term. (5) _________ , where 'distressed stock' needs to be cleared at short notice and this can be stimulated by late availability offers particularly.
(Adapted from The business of tourism)
Choose the best answer for number 4:
- Biến đổi khí hậu hiện đang là một trong những thách thức lớn nhất mà nhân loại phải đối mặt, với những hậu quả nghiêm trọng đối với môi trường, sức khỏe, kinh tế, và đa dạng sinh học.Sự tăng nhiệt độ toàn cầu có thể ảnh hưởng đến diễn thế sinh thái của các hệ sinh thái núi cao như thế nào?
Read the following passage about Life in The Future and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
In the near future, technology is expected to bring about significant changes to how we lead our lives. One of the most notable shifts will be the way we keep up with the rapid pace of technological advancements. With smart homes and autonomous vehicles, our daily routines will increasingly depend on sophisticated systems designed to make our lives easier. For example, smart assistants will look out for our needs, such as ordering groceries, adjusting room temperatures, or even scheduling doctor’s appointments.
Another major development will be in communication. Today, we already use video calls to stay in touch with friends and family across the globe, but the future promises even more immersive experiences. Virtual reality could allow us to hang out with people in virtual spaces, regardless of where they physically are. As a result, geographical barriers will become less relevant, creating a more connected and global society.
Healthcare is also likely to transform. Advances in artificial intelligence will enable doctors to look after patients more efficiently, diagnosing diseases earlier and prescribing personalized treatments. These changes may extend our lifespan and improve our quality of life. Additionally, breakthroughs in renewable energy will play a key role in sustaining our future. With green energy sources, such as solar and wind power, we can cut down on harmful emissions and move toward a more sustainable planet.
While these advancements sound exciting, they also bring challenges. As technology becomes more integrated into our lives, we must be careful to ensure privacy and security. We need to watch out for potential risks, like data breaches and the misuse of personal information. With thoughtful planning, however, the future holds great promise for improving the way we live, work, and interact with the world.
According to the passage, which of the following statements is TRUE?
Read the following passage about human life expectancy and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
Milu was born in a small village in the north of India, and never had the chance of going to school, because her family needed her to work. So she grew up never having learned to read or write. She was a little sad about it, but she didn't let it upset her too much, and tried to think about other things.
She went through life, never being able to do what she wanted, because she felt that if she couldn't read, then she was somehow less than everybody else. This meant that she didn't make many friends and didn't go out much. She thought people would think she was stupid, and she didn't want them to laugh at her.
When she was fifty-six, she got a job cleaning a school and when she had finished her work, she used to sit and watch the little kids do their lessons. She didn't realise that one of the teachers watched her while she watched the kids, and one day, as she was about to leave, the teacher asked her to sit in the class. The kids thought it was very funny, but the teacher patiently started Milu on her first lesson to learn to read.
That was a few years ago, and now Milu can read and write as well as any of the other kids. She still cleans the school because she likes her job, but she doesn't feel less than everybody else anymore. The teacher, who is now her friend, sometimes gives her a book to read and she learns about people living in other parts of the world.
She has a granddaughter who studies at the same school, and sometimes she helps her with her homework. Being able to do that makes her feel so happy that when she stays alone she has a little cry. When she was in her little village as a child, she would never have dreamt that one day she would be able to help her granddaughter with her homework. She owes gratitude to her teacher friend for the gift she was given.
The word ‘patiently’ in paragraph 3 is OPPOSITE in meaning to _____.
Cho parabol \(\left( P \right):{y^2} = 8x\) có tiêu điểm là?
Sau năm 1917, tình hình kinh tế nước Nga có điểm gì nổi bật?
Đâu là toàn bộ các khoản thu, chi của Nhà nước được dự toán và thực hiện trong một khoảng thời gian nhất định do Cơ quan nhà nước có thẩm quyền quyết định để bảo đảm thực hiện các chức năng, nhiệm vụ của Nhà nước?
Cho định lý sau: “Nếu hai tam giác bằng nhau thì hai tam giác đó đồng dạng”.
Phát biểu định lý trên dưới dạng điều kiện cần.
Chuyển động dưới đây được coi là sự rơi tự do nếu được thả rơi?
Nếu tuyến yên sản sinh ra quá ít hoặc quá nhiều hoocmôn sinh trưởng ở giai đoạn trẻ em sẽ dẫn đến hậu quả gì?
Circle A. B. C or D to indicate the correct answer to each of the following questions
She is looking forward to_______you again.
Theo thứ tự từ dưới lên, các tầng đá ở lớp vỏ Trái Đất lần lượt ra sao?
Read the following passage about women in the workplace and mark the letter A, B, C, or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.
Marcel Bich, a French manufacturer of traditional ink pens, was the man (18) ______. Bich was surprised by the poor quality and high price of the ballpoint pens available at the time. However, he realised that the ballpoint pen was a well-established invention, (19) ______ that would succeed in the market.
"Bich approached the Biro brothers and asked for permission to use their original invention in one of his pens. In return, he offered to pay them for each pen he sold. (20) ______, he used a microscope to examine them closely."
By 1950, he was ready to introduce his new design: a plastic pen with a transparent barrel that wrote smoothly, didn’t leak, and cost only a few cents. The new ballpoint pen (21) ______. The public liked it immediately, and today it is as common as the pencil.
Bich's success allowed him to establish Société Bic, which expanded worldwide. (22) ______, producing not only pens but also lighters, razors, and even mobile phones.