Giả sử lợi nhuận biên (tính bằng triệu đồng) của một sản phẩm được mô hình hóa bằng công thức \(P'\left( x \right) =  - 0,0008x + 10,4\). Ở đây \(P\left( x \right)\) là lợi nhuận (tính bằng triệu đồng) khi bán được \(x\) đơn vị sản phẩm.

Sử dụng kí hiệu toán học để viết lại mệnh đề: "Các số tự nhiên chia hết cho $4$ thì chia hết cho $2$".

Sử học và các ngành khoa học tự nhiên và công nghệ có mối liên hệ như thế nào?

Ở một loài thực vật, alen A quy định hoa đỏ trội hoàn toàn so với alen a quy định hoa vàng. Cho cây (P) có kiểu gen Aa tự thụ phấn thu được F₁ tiếp tục cho các cây F₁ tự thụ phấn thu được F₂. Biết rằng không có đột biến xảy rA. Tính theo lý thuyết, cây có kiểu hình hoa đỏ ở F₂ chiếm tỉ lệ:

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.

UNBREAKABLE SPIRIT: AN EVENING WITH NICK VUJICIC

We are thrilled to announce that (1) ______ Nick Vujicic will be visiting our community for an exclusive seminar (2) ______ to inspire, empower, and create lasting change. This once-in-a-lifetime event will offer attendees the opportunity to hear Nick's powerful story of resilience, faith, and perseverance firsthand. Born without limbs, Nick has transformed his circumstances into a source of (3) ______. He has spoken to millions of people around the globe, spreading messages of hope, and the courage to turn obstacles (4) ______ opportunities. Nick’s dynamic and engaging approach has (5) ______ a lasting impact on audiences of all ages and backgrounds. Participants will gain practical strategies for overcoming challenges, achieving personal and professional goals. This event is organized (6) ______ personal growth, motivate change, and cultivate unity. Join us for an unforgettable experience. Space is limited, so be sure to reserve your spot today!

Chức năng quản lý nhóm trong danh bạ điện thoại có tác dụng 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.

Which of the following would best describe Laura Horne’s attitude in the sixth paragraph?

Miền biểu diễn nghiệm của hệ bất phương trình \(\left\{ \begin{align} y\ge -2 \\ x\ge 2 \\ 2x+y\le 8 \\ \end{align} \right.\) là một miền đa giá. Tính diện tích \(S\) của đa giác đó.

Công nghệ mới ứng dụng trong sản xuất vaccine không gồm

Cuộc khởi nghĩa tiêu biểu nhất của nhân dân ba tỉnh miền Đông Nam kì sau Hiệp ước 1862 là

Lực lượng chính trị nắm quyền hành thực tế của Nhật Bản giai đoạn giữa thế kỉ XIX là gì?

Với hơn 100 máy tính ở ba tầng liền nhau của một toàn nhà cao tầng, được nối với nhau bằng dây cáp mạng để chia sẻ dữ liệu và máy in. Theo em, các máy tính này dùng loại mạng nào?

Đợt xuất khẩu gạo của tính \(B\) kéo dài trong 20 ngày. Người ta nhận thấy có lượng xuất khẩu gạo tính theo ngày thứ \(t\) được xác định bởi công thức \(S(t)=t^3-24 t^2+144 t+2500\). Hỏi trong mấy ngày đó, ngày thứ mấy có số lượng xuất khẩu gạo cao nhất?