Tập $A=\left\{ 1;2;3;4;5;6 \right\}$ có bao nhiêu tập hợp con có đúng hai phần tử?

Đâu là ngôn ngữ chính của nhân dân 13 thuộc địa Anh ở Bắc Mĩ?

Chọn câu đúng. Dao động cưỡng bức là dao động của hệ

Cho kí hiệu nguyên tử \({}_8^{17}O\) . Khẳng định nào sau đây sai?

Người tiêu dùng mong điều nào sau đây xảy ra?

Nếu từ các độ cao khác nhau ném ngang các vật với cùng vận tốc thì vật nào ném ở độ cao lớn hơn sẽ có tầm xa

Khi ô tô đang chạy với vận tốc 12 m/s trên đoạn đường thẳng thì người lái xe hãm phanh và ô tô chuyển động chậm dần đều. Cho tới khi dừng hẳn lại thì ô tô đã chạy thêm được 100 m. Gia tốc a của ô tô là bao nhiêu?

Hồ Xuân Hương từng được mệnh danh là gì?

Cho hàm số \(y=2x-1+\frac{1}{x-2}\). Tiệm cận xiên của đồ thị hàm số đã cho là

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

He lacked commitment to the job. He wasn't considered for promotion.

Read the following passage about women in the workplace 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.

Marcel Bich, a French manufacturer of traditional ink pens, was the man (18) ______. Bich was surprised by the poor quality and high price of the ballpoint pens available at the time. However, he realised that the ballpoint pen was a well-established invention, (19) ______ that would succeed in the market.

"Bich approached the Biro brothers and asked for permission to use their original invention in one of his pens. In return, he offered to pay them for each pen he sold. (20) ______, he used a microscope to examine them closely."

By 1950, he was ready to introduce his new design: a plastic pen with a transparent barrel that wrote smoothly, didn’t leak, and cost only a few cents. The new ballpoint pen (21) ______. The public liked it immediately, and today it is as common as the pencil.

Bich's success allowed him to establish Société Bic, which expanded worldwide. (22) ______, producing not only pens but also lighters, razors, and even mobile phones.

Cho hình chóp \(S. A B C D\) trong đó \(A B C D\) là hình chữ nhật, \(S A \perp(A B C D)\). Trong các tam giác sau tam giác nào không phải là tam giác vuông.

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

Which of the following situations best exemplifies “caution” where someone takes care in order to avoid danger or mistakes?

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

a. Don't worry, we'll find it. Let's check the garden first.

b. Oh no, that's terrible! I hope we find it soon.

c. My bird flew away! I can't find it anywhere.

d. I'm so sorry to hear that. Would you like me to help you look?

Cá thể có kiểu gen AB/ab, giảm phân xảy ra hoán vị gen với tần số là f=20%, cho tỉ lệ các loại giao tử là: AB = ab = (1-f)/2=40%, Ab=aB=f/2=10%?

Read the following passage 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.

Working on Your Workout

(I) Although appreciating a balanced diet and regular exercise, most people do not know how to exercise properly. Consequently, they usually rush through their workouts, or they make the same common workout mistakes. (II) Exercising the right way is important for people who are worried about their health and their appearance. (III) However, if someone is not working out properly, they will not see the results they want. Therefore, training experts have devised tips to teach people how to exercise correctly in order to achieve the greatest health benefits. (VI)

One of the most common workout mistakes is doing the same routine over and over again. This does not challenge your muscles, and it can actually prevent muscles from growing and repairing themselves. Instead of always sticking to the same old workout, it is important to change your routine every six to eight weeks. It is also important to add a variety of workouts to your routine, such as swimming, yoga, or biking, to make sure your whole body stays fit. This will help make your workouts more interesting, and benefit your health and muscle development as well.

Another mistake people tend to make is to work out too hard, too often. Your body needs to rest between workouts; otherwise, no progress will be made. It is best to keep the number of hard workout routines to no more than two per week. Then, for those who don’t want to get off schedule by skipping a day, shorter workouts of about twenty minutes can be used on other days. For more variety in workouts, you could also plan an easier routine for forty to sixty minutes between days of shorter, more intense workouts. Experts recommend, however, taking at least one day off completely each week, especially after several hard workout days in a row.

In reality, no one is perfect. However, if you want to make a difference in your overall health, there are some things you can do. Stretch before and after every workout. Do not rush your routine, and do not work out too little or too much. Remember not to make these common workout mistakes, and always have fun while exercising!

The phrase "in a row" is OPPOSITE in meaning to_____:

Dãy bit nào sau đây là biểu diễn nhị phân của số 31 trong hệ thập phân?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

a. They bring people together, fostering a sense of belonging and unity among participants.

b. Festivals in Vietnam offer a vibrant celebration of culture and community.

c. These events showcase traditional music, dance, and cuisine, allowing attendees to experience the rich heritage of the country.

d. Overall, they create a joyful atmosphere that promotes cultural exchange and strengthens social bonds.

e. Festivals also boost local economies by attracting tourists, which helps small businesses thrive.

Cho cấp số nhân với \({{u}_{1}}=3;q=-2.\) Số 192 là số hạng thứu mấy của cấp số nhân?