Với x thuộc tập hợp nào dưới đây thì đa thức \(f(x) = x^2 – 6x + 8\) không dương?

Hai viên bi A và B được thả rơi tự do từ cùng một độ cao. Viên bi A rơi sau viên bi B một khoảng thời gian là 0,5 s. Lấy gia tốc rơi tự do g = 9,8 m/s². Khoảng cách giữa hai viên bi sau thời gian 3 s kể từ khi bi A bắt đầu rơi là

Một đoàn tàu đang chạy với vận tốc 72 km/h thì hãm phanh chạy chậm dần, sau 10 s vận tốc giảm xuống còn 15 m/s. Hỏi phải hãm phanh trong bao lâu kể từ khi tàu có vận tốc 72 km/h thì tàu dừng hẳn (coi gia tốc không đổi)?

Cho hình chóp \(\mathrm{S}. \mathrm{ABC}\) có đáy ABC là tam giác vuông tại \(\mathrm{B}, \mathrm{SA}\) vuông góc với mặt đáy và \(S A=A B=\sqrt{3}\). Gọi \(G\) là trọng tâm của tam giác SAB. Khoảng cách từ \(G\) đến mặt phẳng \((S B C)\) bằng:

Read the following passage about Innovation Driven by Environmental Need 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.

Green startups have emerged as forces for positive environmental change. These companies create sustainable solutions for urgent ecological challenges. Unlike traditional businesses prioritizing profits, green startups balance financial goals with environmental responsibility. Many were founded by young entrepreneurs who witnessed environmental degradation and felt compelled to act. Their mission extends beyond making money; they aim to heal our planet while building successful businesses.

Eco-friendly startups have grown across various sectors. From renewable energy and sustainable agriculture to zero-waste products, these companies revolutionize how we interact with our environment. GreenWave developed ocean farming requiring no fertilizers while capturing carbon. Notpla created edible packaging from seaweed as a plastic alternative. These innovations show how creativity and environmental consciousness produce extraordinary results. Their success proves sustainability and profitability can coexist.

Funding for green startups has increased in the past decade. Investors recognize supporting environmentally responsible businesses is both ethical and financially prudent. Venture capitalists have established funds dedicated to sustainable startups, providing capital to scale operations. Government grants have become more accessible to entrepreneurs developing green technologies. Despite positive developments, green startups still face regulatory hurdles and competition from established industries resistant to change.

The future looks promising for environmental businesses as consumers shift toward sustainable products. Studies show modern consumers, particularly younger generations, will pay premium prices for eco-friendly alternatives. This trend creates fertile ground for green startups to thrive. As climate concerns intensify, demand for innovative environmental solutions will grow stronger. Green startups are positioned to meet this demand while driving positive change, demonstrating business innovation and environmental stewardship can create a sustainable world.

The word “prudent” in paragraph 3 could be best replaced by _________.

Điện áp định mức được kí hiệu là

Dãy bit nào sau đây là biểu diễn nhị phân của số “ 3 ” trong hệ thập phân?

Trong các quốc gia, sự phát triển kinh tế tư bản chủ nghĩa ở quốc gia, khu vực nào là tiêu biểu nhất?

Read the following passage about Vietnamese cultural identity and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questionsfrom 23 to 30.

Vietnamese cultural identity is a rich and intricate tapestry that reflects the nation's long and storied history. Rooted in over a thousand years of civilization, Vietnam's cultural identity is a fusion of indigenous traditions and external influences, shaped by its geographical location and historical interactions.

First and foremost, at the heart of Vietnamese culture is a deep reverence for family and community. Confucian values emphasizing respect for elders, filial piety, and social harmony have played a pivotal role in shaping Vietnamese society. These values are reflected in the close-knit family structures, hierarchical relationships, and communal rituals that are integral to daily life.

Secondly, Vietnamese cuisine is celebrated worldwide for its exquisite flavors and diversity. With its emphasis on fresh ingredients, fragrant herbs, and balanced flavors, Vietnamese food tells a story of the country's agricultural heritage and regional variations. Iconic dishes like pho, banh mi, and spring rolls have become global favorites, representing the culinary artistry deeply ingrained in Vietnamese culture. Also, Vietnam's artistic expressions are equally captivating. Traditional art forms like water puppetry, silk painting, and folk music continue to thrive alongside contemporary artistic movements. Ao dai, a graceful traditional dress, exemplifies the fusion of elegance and modesty in Vietnamese fashion, symbolizing cultural pride and identity.

Today, in the face of modernization and globalization, Vietnamese cultural identity remains resilient. While adapting to the challenges of the 21st century, the Vietnamese people continue to honor their traditions, celebrate their unique cultural expressions, and pass on their heritage to future generations, ensuring that their cultural identity remains vibrant and enduring.

Which of the following is NOT mentioned as Confucian values emphasizing respect for?

Hình thức đấu tranh của giai cấp công nhân Việt Nam trong những năm Chiến tranh thế giới thứ nhất (1914 – 1918) là

Orbital nào sau đây có dạng hình cầu?

Một phát biểu SAI về số hóa hình ảnh là

Read the passage below and choose A, B, C or D.

Although noise, commonly defined as unwanted sound, is a widely recognized form of pollution, it is very difficult to measure because the discomfort experienced by different individuals is highly subjective and, therefore, variable. Exposure to lower levels of noise may be slightly irritating, whereas exposure to higher levels may actually cause hearing loss. Particularly in congested urban areas, the noise produced as a by-product of our advancing technology causes physical and psychological harm, and detracts from the quality of life for those who are exposed to it.

Unlike the eyes, which can be covered by the eyelids against strong light, the ear has no lid, and is, therefore, always open and vulnerable; noise penetrates without protection. Noise causes effects that the hearer cannot control and to which the body never becomes  accustomed. Loud noises instinctively signal danger to any organism with a hearing mechanism, including human beings. In response, heartbeat and respiration accelerate, blood vessels constrict, the skin pales, and muscles tense. In fact, there is a general increase in functioning brought about by the flow of adrenaline released in response to fear, and some of these responses persist even longer than the noise, occasionally as long as thirty minutes after the sound has ceased.

Because noise is unavoidable in a complex, industrial society, we are constantly responding in the same way that we would respond to danger. Recently, researchers have concluded that noise and our response may be much more than an annoyance. It may be a serious threat to physical and psychological health and well-being, causing damage not only to the ear and brain but also to the heart and stomach. We have long known that hearing loss is America's number one nonfatal health problem, but now we are learning that some of us with heart disease and ulcers may be victims of noise as well. Fetuses exposed to noise tend to be overactive, they cry easily, and they are more sensitive to gastrointestinal problems after birth. In addition, the psychic effect of noise is very important. Nervousness, irritability, tension, and anxiety increase affecting the quality of rest during sleep, and the efficiency of activities during waking hours, as well as the way that we interact with each other.

Which of the following statements would the author most likely support?

Hàm số y=sinx xác định trên khoảng nào?

Cho tập hợp A = {x ∈ ℝ| (x² – 1)(x² + 2) = 0}. Các phần tử của tập A là:

Phân tử S₈ có 128 electron, hỏi số hiệu nguyên tử của lưu huỳnh (S) là bao nhiêu?

Tài chính liên quan đến vấn đề nào?

Đặc điểm của nền kinh tế tri thức là gì?

Cho $A=\left[-1;5 \right), \, B=\left(2;7 \right]$. Tập $A \backslash B$ là