tổng gía tri lớn nhất và nhỏ nhất cuả hàm số

\(y=\frac{x^2-4x+1}{x^2-7x+13}\)

Tìm giá trị nhỏ nhất của biểu thức Sina+\(\sqrt{3}\)Cosa

Trong mặt phẳnng tọa độ Oxy cho đường tròn (C) có phương trình \(x^2+y^2-2x+4y+1=0\) và điểm A(1;-3). Tìm toạ độ điểm M thuộc đường tròn (C) sao cho độ dài đoạn MA lớn nhất

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

In the United States, it is important to be on time, or punctual, for an appointment, a class, a meeting, etc... This may not be true in some other countries, however. An American professor discovered this difference while teaching a class in a Brazilian university. The two-hour class was scheduled to begin at 10 a.m, and end at 12 a.m. On the first day, when the professor arrived on time, no one was in the classroom. Many students came after 11 a.m. Although all of the students greeted the professor as they arrived, few apologised for their lateness. Were these students being rude? He decided to study the students’ behavior.

In American university, students are expected to arrive at the appointed hour. On the other hand, in Brazil, neither the teacher nor the students always arrive at the appointed hour. Classes not only begin at the scheduled time in the United States, but they also end at the scheduled time. In the Brazilian class, only a few students left the class at noon, many remained past 12:30 to discuss the class and ask more questions. While arriving late may not be important in Brazil, neither is staying late.

The explanation for these differences is complicated. People from Brazilian and North American cultures have different feelings about lateness. In Brazil, the students believe that a person who usually arrives late is probably more successful than a person who is always on time. In fact, Brazilians expect a person with status or prestige to arrive late, while in the United States, lateness is usually considered to be disrespectful and unacceptable. Consequently, if a Brazilian is late for an appointment with a North America, the American may misinterpret the reason for the lateness and become angry.

As a result for his study, the professor learned that the Brazilian students were not being disrespectful to him. Instead, they were simply behaving the appropriate way for a Brazilian student in Brazil. Eventually, the professor was able to adapt his own behavior to feel comfortable in the new culture.

It can be inferred from the passage that _________.

A. Most American students anive after the class has begun.

B. Most Brazilian students leave immediately when the class is finished.

C. Brazilian students often come late and leave early.

D. For most Americans, being late is unacceptable.

Tìm tổng các giá trị nguyên của tham số m để phương trình 4 sin x + 2 1 + sin x = m có tổng các nghiệm trong khoảng 0 ; π  bằng π .

A. 22

B. 25

C. 30

D. 33

Số thích hợp điền vào chỗ chấm để 1/4giờ = …… phút là

A. 10

B. 20

C. 15

D. 40

Tính nhanh

2007 – ( 0 x 3 4  x 1 4 )

25% của 600kg là: 

A. 120kg

B. 150kg

C. 180kg

D. 200kg