5

Chiến thắng Điện Biên Phủ- 1954

1/3 của số bị của Nam là:

36 x 1/3 = 12 (viên)

số bi Nam cho Việt là:

12 x 1/3 =4 (viên)

Đáp số: 4 viên

Bắt đầu cùng lúc cả hai đồng hồ (7 phút và 11 phút).

Khi đồng hồ 7 phút chảy hết (lúc này đã qua 7 phút), lật lại đồng hồ 7 phút.

Khi đồng hồ 11 phút chảy hết (đã qua 11 phút), lật lại đồng hồ 7 phút một lần nữa.

(Lúc này đồng hồ 7 phút đang còn 3 phút vì đã chạy từ phút 7 → 11)

Khi đồng hồ 7 phút chảy hết lần này (tức thêm 4 phút nữa), tổng thời gian là:

11 + 4 = 15 phút

Vậy ta đo được đúng 15 phút

1. I usually keep in contact with my friends and family by texting and making video calls on social media apps. It helps me feel close to them even when we are far away.

2. Technology helps me study by giving me access to online lessons, videos, and useful information. I can also use apps to practice and improve my skills.

3. I find Mars the most interesting because scientists believe it may have had water in the past, and people are studying it for future exploration.

4. I usually search for study materials, interesting facts, music, and sometimes entertainment like videos or games.

5. When my smartphone stops working, I try to restart it first. If it still doesn’t work, I ask someone for help or take it to a repair shop.

Topic 1

The Internet has changed our lives in many important ways. First, it makes communication much faster and easier. We can send messages, make video calls, and connect with people all over the world in just a few seconds. Second, the Internet helps us learn new things. Students can study online, watch lessons, and find useful information quickly.

In addition, the Internet makes entertainment more convenient. We can watch movies, listen to music, or play games anytime we want. It also helps people work online and even earn money from home.

However, the Internet also has some disadvantages. People may spend too much time online or become less active in real life. In conclusion, the Internet is very useful, but we should use it wisely to improve our lives.

My dream house is by the sea, where I can hear the waves every day. It is a modern house with large windows and a small garden full of flowers. It has a cozy living room, two bedrooms, a kitchen, and a study room. I love it because it is peaceful, beautiful, and perfect for relaxing after studying or working with my family and friends together happily every single day.

1. I think humans will grow food on the moon in the future.

2. If you watch news about UFOs on TV, you will be very surprised.

3. I might focus on learning a new language this summer.

1. → Jupiter is the biggest planet in our solar system.

2. → If I finish my homework, I can go out tonight.

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