Cho tam giác ABC có $AB=4, AC=8$ và $\hat{A}={30}^0$. Tính bán kính R của đường tròn ngoại tiếp tam giác ABC?

Trong ngôn ngữ Python, tên nào sau đây đặt sai theo quy tắc?

Những thay đổi quan trọng trong nền kinh tế Trung Quốc là kết quả của điều gì?

Read the following passage about reading skill 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 18 to 22 

Reading is an essential skill that enhances our cognitive abilities in many ways. Firstly, it improves our language skills. When we read, we learn new words and understand how they are used in context, ___(18)___. This helps in expanding our vocabulary and improving our communication skills. Secondly, reading boosts our imagination and creativity. ___(19)___, it takes us to different worlds and situations we might not experience in real life. This stimulates our creativity and helps us think outside the box. Thirdly, regular reading enhances our concentration and focus. It requires us to pay attention to details and follow complex narratives, ___(20)___. Additionally, reading provides us with knowledge about various subjects and cultures. It allows us to gain insights into ___(21)___. This broadens our perspective and helps us become more empathetic and understanding. Finally, reading is a great way to relax and de-stress. It can be a form of escapism, where we can lose ourselves in a story and forget about our daily worries, which provides a much-needed break for us. In conclusion, reading is not just a leisure activity. It plays a significant role in our cognitive development, helping us to ___(22)___. Therefore, it's important to cultivate a habit of reading from a young age.

Cho hình lăng trụ tứ giác đều \(ABCD.A'B'C'D'\) có cạnh đáy bằng \(a\), góc giữa hai mặt phẳng \(\left( ABCD \right)\) và \(\left( ABC' \right)\) có số đo bằng \({{60}^{0}}\). Cạnh bên của hình lăng trụ bằng:

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 34 to 40.

       Since the birth of the car in 1886, transport in big cities has changed a lot. And it is no wonder that many experts think that there will be extraordinary changes in the next few decades.

       As technology develops, highways, skylines, subways will be all transformed. Smarter roadways and highways in cities outfitted with loT sensors will process all kinds of data in real time and alert users of the best transport options. Weather, crashes, traffic conditions will be communicated to users and smart stops will be found everywhere providing renewable energy, green hydrogen or even greener energy, ensuring efficiency and safety on every highway. Tunnels will also be a smart choice because of the reduction of traffic congestion. Underground roads will be built in 3D with a lift system which will take vehicles deep underground and will allow traffic to attain the greatest speed without intersections.

       There will also be innovations in the sky. Air taxis are not a new idea, but in the future they will be completely environment-friendly. Aviation gasoline will be no longer used. Green energy will be in place and cost-effective air taxis will enable people to travel from one busy urban city to another in record time.

       New technologies such as Al and the rollout of 5G will pave the way for fully autonomous innovation. Cars will not be the only thing to go autonomous. Freight trucks, cargo vehicles, air taxis will all benefit from this technology and that is why the term ‘driver’ will become extinct.

       Transport will go green. Electric or hydrogen power will be mainstream. There will still be issues to solve such as safety, speed and cost, and of course governments will need to make new traffic laws.

(Adapted from Friends Global)

According to the passage, thanks to technology, _____.

Câu nào dưới đây sử dụng cách nói giảm, nói tránh?

Chỉ ra câu sai trong các câu sau?

Hàm số y=sinx xác định trên khoảng nào?

Phát biểu nào không đúng với gió mùa?

Cho ba điểm \(A\), \(B\), \(C\) phân biệt. Điều kiện cần và đủ để ba điểm đó thẳng hàng là

Cho \(A = \{ n = 2k|k \in \mathbb{N},k \le 3\} \) , \(B = \{ n \in \mathbb{N}|n \le 5\} \) và \(C = \{ n \in \mathbb{N}|2 \le n \le 6\} \). Tìm tập hợp sau: \(A{\rm{\backslash }}\left( {B \cup C} \right)\)?

Xác định Mạch điện tử nào được phân loại căn cứ vào chức năng?

Choose A, B, C or D to answer each question.

A study was done on the weights of different types of fish in a pond. A random sample of fish were caught and marked in order to ensure that none were weighed more than once. The sample contained 150 largemouth bass, of which 30% weighed more than 2 pounds. Which of the following conclusions is best supported by the sample data?

Đặt điện áp xoay chiều u = U_ocos100πt (V) (U_o không đổi, t tính bằng s) vào hai đầu đoạn mạch mắc nối tiếp gồm điện trở R = 40Ω và cuộn dây có điện trở thì điện áp hiệu dụng giữa hai đầu cuộn dây là U_d. Lần lượt thay R bằng cuộn thuần cảm L có độ tự cảm $\frac{0,2}{\pi }H$, rồi thay L bằng tụ điện có điện dung $\frac{{10}^{-4}}{\pi }F$ thì điện áp hiệu dụng giữa hai đầu cuộn dây trong hai trường hợp đều bằng U_d. Hệ số công suất của cuộn dây bằng

Với số nguyên dương \(n\), gọi \(a_{3 n-3}\) là hệ số của \(x^{3 n-3}\) trong khai triển thành đa thức của \(\left(x^{2}+1\right)^{n}(x+2)^{n}\). Tìm \(n\) để \(a_{3 n-3}=26 n\).

Tôi mồ côi cha năm hai tuổi

Mẹ tôi thương con không lấy chồng

Trồng dâu, nuôi tằm, dệt vải

Nuôi tôi đến ngày lớn khôn.

Hai mươi năm qua tôi vẫn nhớ

Ngày ấy tôi mới lên năm

Có lần tôi nói dối mẹ

Hôm sau tưởng phải ăn đòn.

Nhưng không, mẹ tôi chỉ buồn

Ôm tôi hôn lên mái tóc

- Con ơi

trước khi nhắm mắt

Cha con dặn con suốt đời

Phải làm một người chân thật…

         (Trích Lời mẹ dặn – Phùng Quán)

Việc nhắc lại lời dặn của cha trước khi mất có ý nghĩa gì với tác giả?

Read the following passage about endangered languages 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 23 to 30.

AVICII’S LIFE AFTER REHAB

Once he completed his month in rehab, Avicii seemed to have a new outlook on life. He was meditating regularly, reading about the collective unconscious, and got a puppy. After not performing for a long period of time, he returned to the stage in 2016 at Miami’s Ultra Music Festival. It was announced a few days after this gig that he would not be performing live anymore. Avicii chose to not perform so that he could focus on bettering his mental health.

Despite appearing to have new-found stability, Avicii still struggled to deal with his mental health issues. While continuing to suppress the anxiety and depression that he frequently felt, Avicii also started to become disinterested in his music career. During this time, he was smoking and drinking on occasion which may have resulted in a resurgence of his disassociation feelings.

He told Tereza Kacerova, his girlfriend at the time, “What if everyone around me is just a projection in my mind? Sometimes I just think these things. About how nothing really matters.”

Avicii started to focus heavily on meditation which he found to be helpful in clearing the “nonsense” from his mind. He believed that a deep form of meditation taught by Maharishi Mahesh Yogi was a way to exercise his brain which he had decided would lead to his happiness. Despite this form of meditation typically being done in 20 minutes increments, Avicii would sometimes spend full days meditating in an attempt to reach enlightenment faster.

The word suppress in paragraph 2 is closest in meaning to

Cho hàm số \(f\left( x \right)={{x}^{4}}+2{{x}^{2}}-3\). Tìm \(x\) để \({f}'\left( x \right)>0\).

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:

Nowadays, many serious childhood diseases _________ by early immunization.