Cho cấp số nhân \[\left( {{u_n}} \right)\] có \[{u_1} = 2\] và \[{u_1} - 12{u_2} - 6{u_3}\] đạt giá trị lớn nhất. Tính tổng 2025 số hạng đầu của cấp số nhân đã cho.

CHỦ ĐỀ: GIẢI NOBEL HÓA HỌC 2020

(Tham khảo bài văn của chủ đề trong đường link dưới đây ở trang 21)

https://tvsthpt.dlib.vn/app/doc-sach-ebook/d00ddd794efd

Và trả lời câu hỏi sau:

Điền một từ không quá HAI tiếng từ bài đọc vào chỗ trống:

Theo đoạn [1], công nghệ chỉnh sửa gen CRISPR/Cas9 được ứng dụng và tạo ra tác động trong các ngành khoa học nghiên cứu về [.......].

Dialogue arrangement: Choose A, B, C or D to make a complete dialogue for each question. 

a. I see that you're pretty talented.

b. I wish I had a talent like that.

c. Oh, so you took an art class?

d. I'm sure you have a talent. It's just hidden.

e. Yeah, I loved that class.

f. Thank you very much.

Rewrite the sentences without changing their meanings. Write no more than FOUR words in each blank.

She isn't qualified for this job because she doesn't speak English fluently.

If __________ , she would be qualified for this job.

Although noise, commonly defined as unwanted sound, is a widely recognized form of pollution, it is very difficult to measure because the discomfort experienced by different individuals is highly subjective and, therefore, variable. Exposure to lower levels of noise may be slightly irritating, whereas exposure to higher levels may actually cause hearing loss. Particularly in congested urban areas, the noise produced as a by-product of our advancing technology causes physical and psychological harm, and detracts from the quality of life for those who are exposed to it.

Unlike the eyes, which can be covered by the eyelids against strong light, the ear has no lid, and is, therefore, always open and vulnerable; noise penetrates without protection. Noise causes effects that the hearer cannot control and to which the body never becomes  accustomeLoud noises instinctively signal danger to any organism with a hearing mechanism, including human beings. In response, heartbeat and respiration accelerate, blood vessels constrict, the skin pales, and muscles tense. In fact, there is a general increase in functioning brought about by the flow of adrenaline released in response to fear, and some of these responses persist even longer than the noise, occasionally as long as thirty minutes after the sound has ceased.

Because noise is unavoidable in a complex, industrial society, we are constantly responding in the same way that we would respond to danger. Recently, researchers have concluded that noise and our response may be much more than an annoyance. It may be a serious threat to physical and psychological health and well-being, causing damage not only to the ear and brain but also to the heart and stomach. We have long known that hearing loss is America's number one nonfatal health problem, but now we are learning that some of us with heart disease and ulcers may be victims of noise as well. Fetuses exposed to noise tend to be overactive, they cry easily, and they are more sensitive to gastrointestinal problems after birth. In addition, the psychic effect of noise is very important. Nervousness, irritability, tension, and anxiety increase affecting the quality of rest during sleep, and the efficiency of activities during waking hours, as well as the way that we interact with each other.

What is the main topic of the first paragraph?

Mệnh đề phủ định của mệnh đề: “ Số 6 chia hết cho 2 và 3” là

Căn cứ vào tính chất, tình trạng thất nghiệp được chia thành 2 loại hình nào?

Vì sao nói Sử học và di sản có quan hệ mật thiết với nhau?

Nguyên nhân nào làm cho phong hoá lí học xảy ra mạnh ở các miền khí hậu khô nóng?

Read the following leaflet 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 7 to 12.

ANNOUNCEMENT OF SCHOOL SPORTS DAY

The School Athletics Department is pleased ___(7)___:

● All athletes ___(8)___ to report at the school field by 08:00 AM on June 10.

● Each team must prepare and submit their entry list for each event. Each athlete is allowed to participate ___(9)___ three events.

● The school will ___(10)___ trophies and medals for the winners in each category.

● ___(11)___ you have any inquiries regarding the event schedule or rules, please contact the Athletics Department.

Typically, all the sports ___(12)___ are concluded by an award ceremony. After finishing all the activities, custom awards, incentives, and more should be given to appreciate the competitors and encourage them to improve.

Ý nghĩa của kí hiệu dưới đây là gì?