Một hình vuông được chia thành 2 hình chữ nhật.Tính chu vi hình vuông,biết rằng tổng chu vi 2 hình chữ nhật là 642cm......................cm

Giải giúp mình tích phân này với ạ Mình cần gấp!!

1. What is a disaster? 2. What should you do to help people after a disaster? 2 câu thôi giúp kunz với quà cáp đầy đủ

Cho đường tròn (O) ,đường kính AB, E là 1 điểm thuộc (O). E không trùng vớiA,B.Gọi M,N lần lượt là trung điểmAE, BE. Tiếp tuyến của (O) tại B cắt ON kéo dài tại D a) tính OD biết OB=5, EB=6 b)chứng minh BDE là tam giác cân c)chứng minh DE là tiếp tuyến của (O) tại E d)chứng minh MONE là hình chữ nhật

Giúp mk với!!!! Giải hết nha!!! Mk vote cho 5*và trả lời hay nhất!

2 - 5/6 : 2/3 + 2/5 x 7/4. Mọi người giải chi tiết giúp em.

Hợp chất quan trọng nhất của clo là gì? Có nhiều trong đâu?

anh/chị hãy trình bày suy nghĩ về hiện tượng lây lan covid-19 từ bệnh nhân số 17

làm hộ em đề 3 với anh chị giúp em đi

Where will you go on your next vacation? Disneyland? Sea World? Outer space? That’s right; tourists are now paying big bucks to travel into space with astronauts! The first space tourist was Dennis Tito, an American businessman. In 2001, he paid about $20 million to ride on a Russian rocket to the International Space Station. The Space Station circles 220 miles above Earth. Tito stayed on the station for a week, hanging out with astronauts and eating space food. The latest space tourist was Anousheh Ansari, an Iranian-born woman from the United States who went to the Space Station in mid-September 2006. How safe is space travel? Apart from the risk of crashing, space tourists have some special things to worry about. Earth’s atmosphere protects us from dangerous radiation from the sun. Space travelers are exposed to more of the sun’s rays. But for tourists spending only a few days or weeks in space, the radiation probably isn’t harmful. A bigger problem might be space sickness. Without Earth’s gravity to hold them down, visitors to the Space Station float around inside the craft. It may look like fun on TV, but it can make first-time space travelers dizzy and sick. Luckily, the sickness usually wears off quickly. Then space tourists can enjoy their trip and the amazing view of Earth. 1. Traveling to space _____ . A. Will be available to everyone B. Is not expensive C. Will be limited to the very wealthy D. Will be limited to the very poor 2. While in outer space it is likely that people will _____ . A. Experience space sickness B. Not need space suits C. Will get a sunburn D. Make side trips to Mars 3. It is probably so expensive to travel to space because_____ . A. Astronauts want to make a lot of money B. Astronaut food is very expensive C. Space equipment and fuel is expensive D. There are high taxes on space travel 4. This passage is ____ . A. A poem B. fiction C. a biography D. non-fiction 5. Why are space travelers exposed to more radiation? A. Their spacesuits are too thin to protect them. B. They lack protection provided by Earth’s atmosphere. C. They stay in the space for such a long time. D. They float around inside the craft and have space sickness.