user-avatar
lucdaotiennhan2002
2 năm trước
Bài 5. Cho tam giác ABC vuông tại C. Gọi D là trung điểm của AB. Kẻ DM vuông góc với AC (M thuộc AC). Gọi E là điểm đối xứng với D qua BC, DE cắt BC tại N a. Chứng minh: tứ giác CMDN là hình chữ nhật b. Tứ giác BDCE là hình gì? Vì sao? giúp mình với mai mình cần rồi
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Read the passage and then choose the best answer for each question. (giải thích nữa nha) Firsts in Life In this month's University, Express. Lynn Zhou interviews students around the world about first in their lives. Read their answers to the question: “What was an important first in life for you? “ Miguel: For me, an important first was getting my driver's license. I got it the moment I turned 18! Being able to drive my father's car that summer gave me freedom, and made me feel like an adult. For example, I’m from Madrid, and mygirlfriend is from a suburb about 30 kilometers away. Driving made it easy for me to see her more frequently. Also, 1 was able to take weekend trips with Iriends to other cities. 1 really liked being independent. Marta: I went on my first date soon after my 16th birthday. It was with my best friend’s brother. He invited me to a movie, but we didn’t talk much. We were both very shy. Two weeks later, I went to a high school dance with him, and we had a great time. After that, we spent most of the summer together, but then heand his family migrated to France. I guess you could say he was my first boyfriend. Soo-Jin: An important first for me was travelling from Korea to Europe. When I was 18, I spent the summer with my cousin backpacking through Europe. It was my first time out of Korea so I was nervous and reluctant to talk to people. Luckily, I overcame my fears and gradually started to open up. I learned to be more independent. I made friends with other travelers at the hostels we stayed at, and I keep in touch with many of them even now. 1. Which of the following did Miguel NOT do with a car? A. He visited his girlfriend more often. B. He visited other cities on weekends. C. He drove his dad around in the summer. D. He could get his driving license. 2. Miguel would like ________ A. to get out of Madrid B. to live in the suburb C. to travel around the country D. to be independent most 3. Where did Martago on her first date? A. the cinema B. the high school danceC. her best friend’s house D. France 4. The reason why Marta stopped dating with her first boyfriend is that_________ A. She and her family migrated to France B. They couldn't spend the summer together any more C. He and his family moved to another country D. She was too shy to date with him again 5. What first does Soo-Jin talk about? A. his first time staying in a hostelB. his first time going out of Korea C. his first time travelling with his cousin D. his first time overcoming his fears 6. After the important first. Soo-Jin ____________ A. has friends from around the worldB. spent the summer with his cousin around Europe C. has lived outside Korea ever sinceD.was reluctant to talk to strange people 7. The common thing that the three young people have is that A. they have the same personalitiesB. they remembered their important first well C. they were shy at their important firstsD. they travelled a lot then 8. The three young people all talked about ____________ A. being independent B. becoming an adult C. their first achievements D. getting over their nervousness 9. In line 1, University Express is probably_______. A. a television show B. a newspaper C. a website D. a college 10. Which of the following CANNOT be inferred about the phrase ‘I got it the moment I turned 18" in paragraph 2? A. Miguel really wanted to learn how to drive. B. Miguel's father wanted him to drive. C. In Spain, you can drive when you turn 18. D. Miguel used to drive when he was 18

tóm tắt hộ mình bài này với Introduction When the sun comes out after it rains, run outside. You may see a rainbow in the sky. Rainbows are tricks made by light. We can see them, but we can't touch them or walk around them. They seem to move away when we try to get close to them. Science can explain how rainbows happen. Where and When Rainbows Appear Look around the next time you see a rainbow. The Sun will be shining from behind you. There will be rain in front of you, where you'll see the rainbow. We usually see a rainbow as a half-circle. It actually forms a full circle . From the ground , we can only see the top half. How Rainbows Form Years ago, a French scientist studied rainbows. He found that to see a rainbow , you must be in the right spot. Rainbows in Myths and Tales • Vikings said a rainbow bridge linked their gods to Earth. • In Ireland , people tell fairy tales about gold hidden at the ends of rainbows . Elves guard these pots of gold. •The Hindu god Indra is shown using a rainbow as an archer's bow to shoot lightning arrows. Knowing how light moves helps explain rainbows . Think of running on land. Now think of trying to run through water. You will move more slowly through water because it is thicker than air. In the same way , light moves faster through air than through water. As the light moves through water , it slows down and bends. Rainbows form when water drops meet sunlight. The light bends when it goes into each drop. Then it reflects, or bounces , off the back of each drop. The light bends again as it leaves the drop. This happens in millions of water drops at once , making the colors of a rainbow. The Colors of the Rainbow Sunlight is made up of many colors Water drops the sunlight into different colors. Splitting light makes a rainbow. You have to be in the right spot to see a rainbow. Each water drop reflects colored light at a slightly different angle. The colors of the rainbow always appear in the same order. The name ROY G. BIV can help you remember the seven main They are red , orange , yellow , green , blue , indigo, and violet. Make Your Own Rainbow 1. Fill a clear glass about three - quarters full of water. 2. Place the glass where sunlight can pass through it. 3. Hold a white piece of paper . Let the light shine through the water onto the paper . Move the paper around until you find a rainbow. 4. Use colored pencils to mark the different colors on the paper. How many can you see ? What order are they in? Conclusion Rain stops and the Sun comes out. A beautiful rainbow sweeps across the sky. Most people find it hard not to stop and stare when a rainbow appears. Science explains how rainbows form. Still , a rainbow is always a magical sight to see .

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team