Cho hàm số \({\rm{f}}({\rm{x}})\) liên tục trên \(\mathbb{R}\) và có đồ thị như hình bên. Giá trị lớn nhất của \({\rm{f}}({\rm{x}})\) trên đoạn [1;2] bằng

Những loài sinh vật nào dưới đây trao đổi khí qua phổi?

Cho hàm số \(y=f(x)\) có đạo hàm trên \(\mathbb{R}\) là \(f^{\prime}(x)=(x+3)(x-4)\). Tính tổng các giá trị nguyên của tham số \(m \in[-10 ; 5]\) để hàm số : \(y=f\left(x^{2}-3 x+m\right)\) có nhiều điểm cực trị nhất

Có mấy kiểu liên kết trong hệ thống cấp nước gia đình?

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.

During the 1960s and '70s, industrialised countries suffered a(n) ______(1), and violent crimes such as muggings increased at an alarming rate. What is more, it was expected to ______(2) worse. Only it didn't. Instead, it got much, much better. In the 1990s, crime started to fall dramatically, and today it is down by almost 50% across the industrialised world and continues to fall. Triumphant politicians will assert that their policies have cut crime. Actually______(3) of the country's policies, the trend does coincide ______(4) the use and subsequent prohibition of tetraethyl lead in petrol, ______(5) for years as a cause of aggressive behaviour. Therefore, countries that still use leaded petrol are being urged to stop ______(6) it to help improve health and crime prevention.

Relay được sáng chế bởi nhà khoa học người Mỹ Joseph Henry vào năm

Read the passage carefully

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.

Choose an option (A, B, C, or D) that best answers each question:

According to paragraph 3, which is TRUE about the salesman?

Tính thẩm mĩ thể hiện ở chỗ:

Trong Chiến dịch Điện Biên Phủ (1954), quân đội Việt Nam đánh Pháp bằng việc:

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!

Xét tính đúng sai của các mệnh đề sau:

Theo định luật 1 Newton thì

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

Hàm số $y=x^3-5x^2+7x-1$ đạt cực đại tại

Đất trồng có nhóm tính chất nào sau đây?