Sóng dọc là

Để làm đường điện dây cao thế ở Hà Giang từ vị trí bản A đến bản B, người ta phải tránh một ngọn núi nên người ta phải nối thẳng đường dây từ bản A đến bản C dài 12 km rồi nối từ bản C đến bản B dài 8 km. Qua đo đạc người ta xác định được $\widehat{ABC}={65}^0$. Hỏi so với việc nối thẳng từ bản A đến bản B, người ta tốn thêm bao nhiêu tiền, biết mỗi km dây có giá 150 000 đồng?

Nội dung nào sau đây không phải là hình thức để học tập và tìm hiểu lịch sử?

Read the following passage about Unconventional Teachers Who Changed Lives 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.

Traditional education focuses on textbooks, but some teachers go beyond these limitations. Mrs. Rodriguez transformed her classroom into a living laboratory. Her students conducted experiments with plants and simple machines. She believed hands-on learning creates deeper understanding than reading alone. When asked why she taught differently, she replied, "I want students to fall in love with discovery." Her methods helped struggling students improve and develop passion for science.

Mr. Jackson abandoned lectures for storytelling and role-playing. His students experienced history by acting out important moments. This approach made history come alive and helped them remember key information. One student said, "Before Mr. Jackson's class, I thought history was boring, but he showed us it's fascinating." He took classes to historical sites and invited veterans to share experiences. These connections helped students understand how past shapes our present.

In a remote village, Ms. Chen taught English without proper textbooks. She created materials using newspapers and song lyrics. Despite limited resources, her students achieved remarkable results through her dedication. "Learning should be joyful, not painful," she told questioning parents. Ms. Chen organized conversation clubs and pen pal exchanges. These activities gave students practical language skills and confidence to use English in real situations.

Coach Williams was a life mentor who taught valuable lessons through sports. He focused on teamwork and fair play rather than winning. Students who struggled academically often excelled in his class. "The playing field is where children learn who they truly are," he explained. He created inclusive activities for all students regardless of athletic ability. Many former students credit him with teaching life skills like resilience and cooperation that helped them succeed after graduation.

The word “conducted” in paragraph 1 is OPPOSITE in meaning to _________.

Tìm tất cả các giá trị thực của tham số m để đồ thị hàm số $y=x^4-2m{x}^2$có 3 điểm cực trị là tạo thành 1 tam giác đều?

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.

Based on the original The Voice of Holland, The Voice of America, or sooner The Voice, officially aired on NBC on April 26, 2011, aiming to find new singing talent and soon became a big hit.

The Voice process includes Blinds Audition, Battles Rounds, Knockout Rounds, and the final live performance phase. Only those fifteen and over are eligible for the competition. There are four coaches, themselves well-known performing artists, who critique contestants' performances and form their own teams of contestants and give them guidance through the rest of the season. Coaches also have the power to decide on which contestants to advance in the next rounds. One celebrity key advisor gives assistance to the coaches and their teams during the preparation process.

The coaches and the television audience have equal power to decide who moves on to the final four phase. However, the winner is determined by votes from the television audience by online voting on the official website, SMS text and iTunes stores purchases of the contestants' performances. The declared winner receives US$100,000 and a record contract with Universal Music Group.

As an incredible success in both Holland and the U.S., The Voice has been franchised out to many other countries in the world and has been a big rival to the Idol franchise.

What is the requirement for contestants?

Cho tứ diện ABCD. Gọi P, Q, R, S lần lượt là các điểm trên cạnh AB, BC, CD và DA. Nếu 4 điểm P, Q R, S đồng phẳng. Chọn khẳng định sai? 

Đơn vị lưu trữ dữ liệu lớn nhất là

Công của lực điện trường dịch chuyển một điện tích 5.10^-6 C dọc theo chiều một đường sức trong một điện trường đều 1000 V/m trên quãng đường dài 0,5m là

Dị hóa ở vi sinh vật là quá trình như thế nào?1.html

In Part Three of the Speaking Section you work together with a partner. You have to do a single task which usually lasts about 3 minutes. One possible task is “problem solving”, which means you have to look at some visual information and then discuss the problem with your partner. You may be shown photos, drawings, diagrams, maps, plans, advertisements or computer graphics and it  is essential that everyone (631)___________ them carefully. If necessary, check you know exactly (632) ________________ the examiner to repeat the (633) __________ or make them clearer.

While you are doing the task, the examiner will probably say very little and you should ask your partner questions and (634)  ___________ suggestions if he or she is not saying much. If either of you have any real difficulties, the examiner may decide to step in and help. Normally, however, you find plenty to say, which helps the assessor to give you a fair mark. (635) ____________in doing the task by competing with your partner, which includes taking turns in giving opinions and replying appropriately, although in the end it may be possible to “agree to disagree”.

Câu 632:

Cho các quá trình biến đổi sau:

(1) Nước sôi bay hơi.

(2) Nhúng đinh sắt vào dung dịch acid chloride thấy sủi bọt khí, đinh sắt tan dần.

Khẳng định đúng là

Khi ô tô đang chạy với vận tốc 10 m/s trên đoạn đường thẳng thì người lái xe tăng ga và ô tô chuyển động nhanh dần đều. Sau $20s$, ô tô đạt vận tốc $14m/s$. Gia tốc và vận tốc của ô tô sau $40s$ kể từ lúc bắt đầu tăng ga lần lượt là

Luật An ninh mạng được Quốc hội nước Cộng hòa xã hội chủ nghĩa Việt Nam thông qua vào thời gian nào?

Chọn ý đúng: Giá thể trấu hun là:

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 35 to 40.

How to Live Your Life Actively?

If you are not naturally sporty, and finding ways to fit more activity into your daily life, here are several tips to help you make a routine (35) ____________ being active:

Select a realistic exercise plan.

Track your progress using a health app (36) ____________ a paper checklist.

Take every opportunity to do such strength-building activities as carrying (37) ____________ and climbing the stairs.

Invite friends and (38) ____________ family members to join in, and try (39) ____________ everyone's competitive side with challenges like seeing who can do the most steps or cover the most distance in a day.

Reward yourself with a treat like a favourite TV show if your plan works (40) ____________ to maintain your motivation.

(Adapted from https://www.nhs.uk)

Choose the best answer for number 35:

Các bước nào dưới đây là đúng khi nói về tiến trình của phương pháp quan sát?

Để nhận biết nguyên tố Ca cần sử dụng dung dịch nào dưới đây?

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

Hãy cho biết: Virut từ bên ngoài xâm nhập vào tế bào thực vật thường bằng cách nào?