Kết nối lịch sử với cuộc sống chính là 

Cho hình bình hành ABCD có \(AB = 8cm\), \(AD = 12cm\) , góc \(\angle ABC\) nhọn và diện tích tam giác ABC bằng \(27{\mkern 1mu} c{m^2}\) Khi đó \(\cos \left( {\overrightarrow {AB} ,\overrightarrow {BC} } \right)\) bằng 

Trong thí nghiệm lai giữa cây cải bắp (2n = 18) và cây cải củ (2n = 18), hầu hết con lai khác loài được tạo ra đều bị bất thụ, nhưng một số ít cây có khả năng sinh sản do đột biến làm tăng gấp đôi số lượng nhiễm sắc thể, tạo thành loài mới. Phát biểu nào sau đây Sai?

Chọn ý đúng: Theo em vai trò của ngành bưu chính viễn thông đối với phát triển kinh tế là gì?

Phương án nào sau đây thể hiện rõ nhất ứng dụng của hệ nhị phân trong tin học?

Điền thông tin thích hợp để hoàn thành bài tập sau:

Hợp chất A có công thức M₄X₃. Tổng số hạt proton, neutron và electron trong phân tử A là 214. Tổng số hạt proton, neutron, electron của [M]₄ nhiều hơn so với [X]₃ trong A là 106. Biết rằng số hạt proton, neutron trong nguyên tử thoả mãn điều kiện bền sau: $1\le\dfrac{N}{Z}\le1,5$, với N là số neutron, Z là số proton.

1. Công thức hoá học của A là .

2. Số electron độc thân của nguyên tử M là .

Điền số nguyên dương thích hợp vào chỗ trống.

Cho tứ diện \(ABCD\). Lấy hai điểm \(M,N\) lần lượt là trọng tâm của các tam giác \(ABC\) và \(ABD\). Cho các khẳng định sau:

1) \(MN//\left( BCD \right)\).

2) \(MN//\left( ACD \right)\).

3) \(MN//\left( ABD \right)\).

Trong các khẳng định trên, có (……) khẳng định đúng.

Các cấp tổ chức sống không có đặc điểm nào?

Which of the following best restates each of the given sentences?

Scientists have not produced a miraculous drug which can cure SIDA.

Biết I_o là cường độ âm chuẩn. Tại điểm có cường độ âm I thì mức cường độ âm là

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

In sport commentaries, justice and impartiality to both sides are vital, but spontaneity and enthusiasm are valued by those watching or listening.

a) Mệnh đề \(P\) là mệnh đề đúng.

Peptit Ala-Gly-Val-Ala-Glu có bao nhiêu liên kết peptit?

Ngân sách nhà nước bao gồm những khoản nào?

Read the following passage about the The Importance of Social Media in Modern Society 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.

In the 21st century, social media has become a crucial element of everyday life[I]. Platforms such as Facebook, Twitter, Instagram, and TikTok link individuals around the world, [IV]. Although some may critique social media for promoting negativity, it is important to acknowledge its numerous positive effects on society[III]. This essay will delve into the importance of social media, its influence on shaping public perception, and the challenges it poses.[II]

One of the primary benefits of social media is its ability to foster communication and connection. People can maintain relationships with friends and family, regardless of geographical barriers. This aspect is particularly vital for those who live far away from loved ones. For example, a student studying abroad can easily share their experiences with family through posts, photos, and video calls. Furthermore, social media enables individuals to connect with like-minded people and build communities around shared interests or causes. Activist groups, for instance, often use social media platforms to rally support for important issues, raising awareness and mobilizing action more efficiently than traditional methods.

Moreover, social media serves as a powerful tool for information dissemination. News spreads rapidly through these platforms, allowing individuals to stay informed about current events. During emergencies, such as natural disasters, social media can provide crucial information in real time, helping people stay safe and informed. However, this rapid dissemination of information also raises concerns about the accuracy and reliability of the content being shared. Misinformation can spread just as quickly as legitimate news, leading to confusion and mistrust.

Despite the challenges posed by misinformation, social media plays a significant role in shaping public opinion. People often turn to these platforms to voice their opinions and engage in discussions on various topics. For instance, political debates and social movements frequently gain traction through social media, allowing individuals to express their views and influence others. This democratization of discourse can empower marginalized voices and facilitate social change. However, it is crucial to approach online discussions critically, as echo chambers can form, reinforcing existing beliefs rather than encouraging open dialogue.

In conclusion, while social media presents challenges such as misinformation and polarized discussions, its positive contributions to communication, information dissemination, and social activism cannot be overlooked. As society continues to evolve, it is essential to harness the potential of social media while being mindful of its pitfalls. By promoting responsible use and critical thinking, we can maximize the benefits of social media and foster a more connected and informed society.

Which of the following best summarises the passage?

Read the following passage about the urban shift 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. (2,5 points)

            [I] Water is one of the most essential resources on our planet, vital for all forms of life. However, increasing demand and pollution are putting immense pressure on our freshwater supplies. [II] According to recent studies, nearly 2 billion people worldwide live in countries experiencing high water stress, leading to a decline in the availability of this precious resource. This situation not only affects drinking water but also agriculture, sanitation, and energy production.

            The primary causes of water scarcity include population growth, urbanization, and climate change. As cities expand, the demand for water increases significantly. Moreover, agricultural practices that rely heavily on water are becoming unsustainable in many regions. Climate change further exacerbates these issues, causing unpredictable weather patterns and extreme droughts, which reduce water availability.

           [III] In response to this growing crisis, everyone must prioritize water conservation. Simple actions, such as fixing leaks, using water-efficient appliances, and practicing mindful consumption, can make a significant difference. Additionally, implementing policies that promote sustainable water management and investing in technologies for water recycling can help mitigate the impacts of water scarcity. [IV]

            Despite these efforts, the challenges remain substantial. It is crucial that we recognize the importance of conserving water and take immediate steps to protect this vital resource for future generations.

Which of the following is TRUE according to the passage?

Các ngành công nghiệp nào có điều kiện tài nguyên thuận lợi để phát triển ở phần lãnh thổ phía Tây của nước Nga?

Địa hình của Cộng hòa Nam Phi chủ yếu là gì?

Nội dung nào thể hiện vai trò của hoạt động tiêu dùng đối với sản xuất?

Mark the letter A, B, C or D to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of thefollowing questions from 25 to 29. 

a. Customer Service: Hello, this is the Bus Operation Center.

b. Tom: The buses are always running late, especially during rush hour.

c. Tom: I want to complain about bus No. 7.

d. Customer Service: What seems to be the problem?

e. Customer Service: I'm sorry to hear that. Unfortunately, there's nothing we can do about it. Due to the high volume of traffic, buses can sometimes be delayed.