Hai xe ô tô chạy cùng chiều trên một đoạn đường thẳng với vận tốc 100 km/h và 80 km/h. Tính vận tốc của xe thứ nhất so với xe thứ 2. Chọn chiều dương là chiều chuyển động của hai xe.

Đâu là ý đúng khi nói về giá thể than bùn?

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.

Living Every Moment Fully: Secrets to Happiness in the Digital Era

Are you seeking balance in your life? The (1)_________ balance between online and offline worlds awaits you!

Our modern (2)_________ create unnecessary daily life stress in our increasingly connected world. Stolen moments (3)_________ your phone during important conversations add up to lost time. We should remind people (4)_________ the value of being present together.

The secret (5)_________ in finding your perfect digital-life harmony through mindful technology use. Start prioritizing real connections today (6)_________ your life into something meaningful.

Contact us now at Digital Wellness Center for your free consultation!

Nội dung nào sau đây thể hiện chức năng hành pháp của Chính phủ nước Cộng hoà xã hội chủ nghĩa Việt Nam?

Read the passage carefully. Choose an option (A, B, C, or D) that best answers each question from to 646 to 650:

1. Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

2. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

3. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't  agree.

4. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

5. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

What is the word “potentially” in paragraph 4 closet in meaning to?

Rô-be-spi-e và phái Giacôbanh bị lực lượng tư sản phản cách mạng tiến hành đảo chính vì:

Tình trạng thất nghiệp xuất hiện có tính chu kì khi nền kinh tế bị suy thoái hoặc khủng hoảng dẫn đến mức cầu chung về lao động giảm được gọi là gì?

Trong mặt phẳng tọ̣ độ \(Oxy\), cho ba điểm \(A(2;4),B(0; - 2),C(5;3)\). Đường thẳng đi qua điểm \(A\) và song song với đường thẳng \(BC\) có phương trình là?

Vào năm nào Việt Nam đã ban hành Bộ mã kí tự Tiếng Việt 16-bit?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

Question 14: 

a. Alex: Why online classes?

b. Sue: I'm going to try online classes.

c. Alex: How are you going to improve your English?

d. Alex: I think online classes are too expensive. I don't think I'll try them.

e. Sue: They improve our communication skills, and they have flexible schedules.

(Adapted from i-Learn Smart World)

Cho tứ diện ABCD có BCD là tam giác vuông tại đỉnh \(B\), cạnh \(C D=a, B D=\frac{a \sqrt{6}}{3}\), \(A B=A C=A D=\frac{a \sqrt{3}}{2}\). Tính cosin của góc nhị diện \([\mathrm{A}, \mathrm{BC}, \mathrm{D}]\).

Sử dụng các kí hiệu đoạn, khoảng, nửa khoảng để viết tập hợp $A = \{ x \in \mathbb{R} \Big| 7 \le x \le 10\}$.

Để nhập từ bàn phím biến a kiểu nguyên ta viết:

Cho hai tập hợp $A=\left[ -2;3 \right)$ và $B=\left[ m;m+5 \right)$. Tất cả các giá trị thực của tham số $m$ để $A\cap B\ne \varnothing$ là

Read the following passage 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 20 to 27.

Traditional Media

Before the invention of newspapers, the main source of news was word of mouth. Any writings and drawings were done by hand. Although printing presses had existed in eastern Asia, it was Gutenberg’s invention in Europe in 1453 that made printing faster and books more accessible. It reduced the cost and size of printed books and made them the first form of mass media affordable to less wealthy people. Gutenberg’s invention also quickened the spread of discoveries and information, and promoted literacy in Europe.

The printing press led to the rise of printed newspapers that appeared regularly. The first newspapers developed from around 1612 and in a short period of time, they became very popular in Europe and the European colonies. In the 19th century, they also appeared in Asia.

Newspapers and magazines are still very popular today. Although most of them have online versions, many people continue to read print media, which is considered more credible than digital media.

In the 1920s, when radio, television, and video were introduced, the phrase “the media” began to be used. Black and white television quickly became popular in the 1950s, and in the 1960s colour broadcasts started in many countries. Thanks to its audiovisual presentation, television became one of the most important forms of mass media in the 20th century. As a source of news, entertainment, and education, it still attracts a large number of viewers today.

(Adapted from English Workbook 12 – Global Success)

The word promoted in paragraph 1 can be best replaced by .

Chọn ngẫu nhiên lần lượt các số \(a, b\) phân biệt thuộc tập hợp \(\left\{3^{k} \mid k \in \mathbb {N}, 1 \leq k \leq 10\right\}\). Tính xác suất để \(\log _{a} b\) là một số nguyên dương.

Tập xác định của hàm số ${\log }_5\left(x^3-x^2-2x\right)$ là?

Nhà nước thường ban hành những chính sách nào sau đây để hạn chế tình trạng lạm phát do chi phí đẩy?

Hoạt động phân chia các yếu tố sản xuất (vốn, lao động, nguyên vật liệu,...) cho các ngành sản xuất, các đơn vị sản xuất khác nhau để tạo ra sản phẩm (phân phối cho sản xuất) và phân chia kết quả sản xuất cho tiêu dùng được gọi là gì?

Nhận xét nào không đúng với ngành giao thông vận tải của Liên bang Nga?