Trong mặt phẳng \(Oxy\), đường thẳng \(d:\,x - 2y - 1 = 0\) song song với đường thẳng có phương trình nào sau đây?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Ta kiểm tra lần lượt các đường thẳng
.+) Với \(d{}_1:x + 2y + 1 = 0\) có \(\frac{1}{1} \ne \frac{2}{{ - 2}} \Rightarrow d\) cắt \(d{}_1\).
.+) Với \(d{}_2:2x - y = 0\) có \(\frac{2}{1} \ne \frac{{ - 1}}{{ - 2}} \Rightarrow d\)cắt \(d{}_2\).
.+) Với \(d{}_3: - x + 2y + 1 = 0\) có \(\frac{{ - 1}}{1} = \frac{2}{{ - 2}} \ne \frac{1}{{ - 1}} \Rightarrow d\)trùng \(d{}_3\).
.+) Với \(d{}_4: - 2x + 4y - 1 = 0\) có \(\frac{1}{{ - 2}} = \frac{{ - 2}}{4} \ne \frac{{ - 1}}{{ - 1}} \Rightarrow d\) song song \(d{}_4\).
Đáp án D.
Bộ Đề Kiểm Tra Giữa Học Kì II - Toán 10 - (Năm 2023 - 2024) - Các Trường THCS Trên Toàn Quốc được biên soạn nhằm giúp học sinh tiếp cận và làm quen với dạng câu hỏi trắc nghiệm thường gặp trong các bài kiểm tra. Tài liệu hỗ trợ rèn luyện khả năng tư duy và ứng dụng kiến thức vào giải quyết các vấn đề.
Câu hỏi liên quan
Read the following passage about wildlife conservation 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 31 to 40.
[I] Wildlife conservation refers to the efforts made to protect and preserve wild animal species and their habitats. [II] It is crucial for maintaining biodiversity, which plays a vital role in ecosystem stability and health (Smith & Jones, 2018). [III] Unfortunately, many species are threatened due to habitat destruction, poaching, and climate change, making conservation efforts more urgent than ever. [IV]
One of the primary reasons for wildlife conservation is the preservation of biodiversity. A diverse range of species contributes to ecosystem services, such as pollination, water purification, and climate regulation. The loss of a single species can disrupt these services and lead to ecological imbalances. For instance, the decline of pollinators like bees has serious implications for food production and agriculture (Global Biodiversity Outlook, 2020).
Moreover, wildlife conservation has significant economic benefits. Many communities depend on ecotourism, which relies on healthy wildlife populations and intact ecosystems. According to a study by the World Wildlife Fund (WWF), ecotourism can generate billions of dollars in revenue, providing jobs and supporting local economies (WWF, 2021). Protecting wildlife not only safeguards natural resources but also creates sustainable livelihoods for local populations.
However, effective wildlife conservation requires a collaborative approach. Governments, non-governmental organizations, and local communities must work together to implement policies and strategies that promote conservation efforts. Community-based conservation initiatives, where local people actively participate in protecting their natural resources, have shown promising results. These initiatives empower communities and ensure that conservation efforts are tailored to local needs and contexts (Bennett & Dearden, 2014).
Which of the following can be inferred from the passage?
CHỦ ĐỀ: TÁC ĐỘNG CỦA SUY THOÁI KINH TẾ ĐẾN SẢN XUẤT KINH DOANH CỦA CÁC DOANH NGHIỆP Ở MỘT SỐ TỈNH PHÍA BẮC
(Tham khảo bài văn của chủ đề trong đường link dưới đây ở trang 21)
https://tvsthpt.dlib.vn/app/doc-sach-ebook/d00b996754ec
Và trả lời câu hỏi sau:
Dòng nào là thông tin chính xác được đề cập trong văn bản?
Read the following passage about the impact of social media on mental health 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 31 to 40.
[I] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]
A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.
There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.
Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can enhance mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).
Which of the following can be inferred from the passage?
Phenol được tổng hợp từ cumene (isopropylbenzene) bằng phản ứng oxi hóa bởi oxygen rồi thủy phân trong môi trường acid thu được hai sản phẩm là phenol và acetone theo phương trình hóa học sau:
Người ta tiến hành điều chế phenol từ 2 tấn cumene. Khối lượng phenol điều chế được từ lượng cumene trên là (Biết hiệu suất phản ứng là \(90 \%\) ).
Read the following passage about education in Nepal 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 31 to 40.
Fashion in the 1960s reflected the cultural and political upheaval of the time. The hippie and counterculture movement gave rise to accessories like Pocahontas-style headbands and medallions worn around the neck. Hippies wore long, loosely fitting clothing, often in natural fabrics. Hemlines rose as Mary Quant popularized the miniskirt and hot pants in her lines for JC Penney. And mod fashion, with brightly colored space-age geometric patterns, shift dresses and colored tights became the mainstream. Both miniskirts and mod-shift dresses were worn with knee-high go-go boots.
[A] During the 1970s, the loose-fitting hippie clothes of the prior decade gave way to exotic fabrics and bell-bottom jeans for men and women. Hemlines continued to rise and hot pants continued their popularity, reflecting the flashy style of the decade. However, the 1970s also saw the popularity of a longer hemline, from mid-calf to ankle-length. [B] Women wore peasant-style clothing, especially blouses with off-the-shoulder necklines and lace trim, with their jeans or skirts. [C] Disco fashion emerged, featuring bright patterns and tightly fitting clothing meant to show off the body. Platform shoes elevated their wearer, male or female, anywhere from two to four inches or more. [D]
The 1980s saw another fashion upheaval. Angst-ridden punks wore Dr. Marten and steel-toed army boots, chains, tartan patterns, and bondage pants. Punks focused more on their hair during this period, dying, teasing and chopping their hair into asymmetric styles that seemed to defy gravity. Women—and men—experimented with heavy eyeliner in a variety of colors. Women wore neon colors, jelly shoes, tight jeans, leggings, leg warmers and oversized sweatshirts. Menswear-inspired looks also became popular for both sexes. Men wore ‘power suits,’ named so for their price, which made these suits a reflection of the wealth of the wearer. Women’s jackets featured big shoulder pads that made the shoulders appear higher and larger, similar to the male silhouette.
1990’s fashion was far more subdued than the garish, wild styles of the 1980s. Bands like Nirvana influenced the grunge look, which featured rock-concert tee shirts under plaid flannel shirts, jeans and long, greasy hair. Overalls were worn by both sexes, either with one or both shoulder straps unhooked. The punk style of the 1870s and 1980s evolved into the goth fashion trend, which featured black clothing, black boots and studded bracelets in the style of bands like Nine Inch Nails and Marilyn Manson.
The word “elevated” in paragraph 2 mostly means ______.
Đâu là ý đúng: Tiêu chí thứ hai trong đánh giá công nghệ là gì?
Read the following passage about managing change 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 31 to 40.
Growing up in Athens, Greece, Lydia Borsi remembers feeling tested when she tried to deal with mental health issues. Borsi says she had been seeing a therapist for anxiety. But she notes that people in Greece do not openly discuss mental health issues, which also get little attention in general healthcare services. “It was a lot more secretive. And people thought that I was a lot more unique,” Borsi said.
That all changed in 2017 when she moved to the United States to study at the University of Rochester in Rochester, New York. “When I came here, I really liked that people were not afraid to speak up about mental health and say that it’s important,” she said. The university was very supportive of her needs and offered plenty of information. She also became involved with a school group called Active Minds that helps students deal with mental health issues. [A]
Then due to the spread of the novel coronavirus, the University of Rochester had to move all its classes and some of its mental health resources online. Luckily, Borsi was able to connect with a mental health expert outside the school, in the local community. [B]
But as many of her American friends returned home, Borsi was stuck. Greece had succeeded in limiting the spread of the virus within its borders, but flights there from the U.S. are barred until July. Also, the health crisis has put her plans to seek admission to medical school in Britain on hold. [C] And she is not alone.
[D] In April, Active Minds launched a survey of over 2,000 students at U.S. colleges and universities. The study found that over 80 percent of those asked said the coronavirus crisis had negatively affected their mental health. One in five said it has affected them severely.
Laura Horne, chief program officer at Active Minds, says the findings are especially troubling given that the crisis is only going to make it harder for colleges and universities to help these students. “Colleges and universities had to pivot rather quickly to respond to COVID-19 and figure out all facets of university life, including mental health services. Now they have to figure out how to communicate with students,” Horne said.
Frank Chen is a Houston, Texas-based psychiatrist who has worked with college-age young adults. He points out that individuals at that age are in an important stage of their mental development. And college can be a difficult experience for students with or without mental health issues, as they balance work, studies, and personal relationships. Adding a major world event, like the spread of the coronavirus, makes it very difficult to predict what the long-term psychological effects might be. “I don’t think that there’s another event in the history of the people who are alive now that can really measure up to this,” said Chen.
In which space (marked A, B, C and D in the passage) will the following sentence fit?
Far from her family and unsure about the future, Borsi says dealing with the virus has not made her mental health problems any easier.
Mặt đứng của ngôi nhà:
Nguyên tử iron (kí hiệu là Fe) ở 20oC có khối lượng riêng là 7,87 g/cm3. Với giả thiết này, tinh thể nguyên tử Fe là những hình cầu chiếm 75% thể tích tinh thể, phần còn lại là những khe rỗng giữa các quả cầu. Cho biết khối lượng nguyên tử của Fe là 55,847 amu. Bán kính nguyên tử gần đúng của Fe là
Phần I. Trắc nghiệm nhiều phương án lựa chọn
Nhận định nào đúng về tình hình cung - cầu lao động trên thị trường ở Việt Nam năm 2021 trong thông tin dưới đây?
"Năm 2021, lực lượng lao động từ 15 tuổi trở lên của Việt Nam đạt 50,6 triệu người. Trong đó, lao động đang làm việc trong các ngành kinh tế là 49,1 triệu người. Tỉ lệ thất nghiệp của lực lượng lao động trong độ tuổi ước tính là 3,20%, tỉ lệ thiếu việc làm của lao động trong độ tuổi là 3,10%".
Mùa xuân ở các nước theo dương lịch tại bán cầu Nam được tính từ ngày bao nhiêu?
Loại hình văn học nổi tiếng nhất ở Trung Quốc dưới thời Đường là
Lamac giải thích như thế nào về đặc điểm của hươu cao cổ có cái cổ rất dài?
Xác động vật và thực vật phải trải qua quá trình biến đổi nào cây mới có thể sử dụng được nguồn nitơ?
Cho bảng số vận tải hàng hóa bằng đường hàng không chia theo hình thức giai đoạn 1995 – 2020, đơn vị: nghìn tấn (Niên giám thống kê Việt Nam 2021, Nxb Thống kê, 2022):
Nhận xét nào sau đây đúng với bảng số liệu trên?
Trên trang web học liệu mở ta có thể làm gì?
Read the following passage about online dating 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.
Psychologists have found many advantages and disadvantages to online dating. Among the many criticisms aimed at online dating, the most severe concern is its effects on people's self-esteem and mental health.
Swipe left or right is the main feature of popular dating apps, where users quickly look at profiles. However, this system is criticized for being superficial. A study showed that users often feel less satisfied with their appearance. Jessica Strübel found that after a while, users begin to feel less like unique, special individuals and more like they're disposable. This feeling leads to users becoming increasingly sensitive about their looks and bodies, heightening self-consciousness. Dating apps also added to the idea that there's always something better around the corner, which further pressures users into trying to appear more attractive.
Dating apps not only harm self-esteem but also alter perceptions of relationships. By accelerating the dating process, these apps encourage poor social behavior. For instance, it's not unusual for people to ignore "likes" and messages or to lose interest and cut off communication. This behavior would have been considered extremely rude in the past. But with online dating, it is a common reality.
Furthermore, thirty-five percent of users actually reported feeling pessimistic about dating. Only twenty-eight percent of surveyed users reported feeling hopeful after using a dating site or app.
The word profiles in paragraph 2 is CLOSEST in meaning to _____.
Một xe máy chuyển động thẳng đều với vận tốc 54 km/h thì hãm phanh và chuyển động chậm dần đều. Sau khi hãm phanh 4 s tốc kế chỉ 18 km/h. Tính gia tốc của xe?
Khi nói về phản ứng tổng hợp hạt nhân, phát biểu nào sau đây là sai?