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buikimchi.01
2 năm trước
đội tuyển olympic học sinh tiểu học cấp huyện của một trường có số bạn nam bằng 2/3 số bạn nữ. sau đó, vì có một bạn nam không tham gia nên số bạn nam lúc này bằng 50 phần trăm số bạn nữ. hỏi lúc đầu đội tuyển olympic học sinh của trường đó có bao nhiêu nam, bao nhiêu nữ
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Telephones help people speak to one another when they are apart. For more than a hundred years, nearly every telephone was a landline. A landline telephone is one that needs to be connected by a wire to a network of other telephones. Because of the wires, people could not take those telephones with them when they left their homes or offices. What if you had to make a call while you were away from home? You had to find a pay phone. Paỵ phones are landlines found in public places. Many pay phones are on the Street. You can make a call from inside a glass or metal space called a phone booth. Once you are inside the booth, you put coins into a Slot in the phone to make a call. Telephones have seen a lot of progress. Today, many people carry cell phones. Cell phones do not need to be connected with wires. They can be used almost anywhere and can fit in an adult’s hand. Many cell phones sold today are smart phones. A smart phone is a cell phone that has lots of computer-style features. For example, people use smart phones to check e-mail and go on the Internet. And all that can be done using something small enough to carry in a pocket! 1. What is a landline telephone? A. a telephone that can be carried around in your pocket and used any where B. a telephone that can be used in a public place C. a telephone that needs to be connected by a wire to a network of other telephones D. a telephone that can be used to check e-mai! and go on the Internet 2. The article describes an example of a landline. What is an example of a landline? A. a pay phone B. a smart phone C. a cell phone D. a mobile phone 3. Pay phones are probably not used as much today as they were in the past. What piece of evidence supports this conclusion? A. Many people today carry cell phones, which can be used almost anywhere. B. Payphones are landlines that can be found in public places. C. People could not take landlines with them when they left their homes. D. People put coins into a Slot in the pay phone to make a call. 4. What might be a reason that cell phones were invented? A. People wanted to be able to make calls from their homes or offices. B. People wanted to be able to make calls away from home without finding a pay phone. C. People wanted to be able to speak to one another when they were apart. D. People wanted to be able to speak and see each other from far distance. 5. What is the main idea of this article? A. Telephones are used to keep people apart as much as possible. B. Cell phones are much less useful than landlines and pay phones. C. landlines and pay phones still play an important part in the world nowadays. D. Telephones have been used for many years, and they have changed a lot over time.

Bài 1: Từ điểm A ở ngoài đường tròn (O) vẽ hai tiếp tuyến AB, AC đến (O) (với B, C là hai tiếp điểm ). Gọi E là giao điểm của AO và BC . Gọi I là trung điểm BE. Đường thẳng qua I vuông góc với OI cắt các tia AB,AC theo thứ tự tại D,F. Chứng minh tam giác ODF cân tại O và F là trung điểm AC. Bài 2: Cho đường tròn (O). Lấy điểm A nằm ngoài đường tròn (O), đường thẳng AO cắt (O) tại hai điểm B và C với AB<A. Qua A vẽ đường thẳng không đi qua O cắt (O) tai hai điểm D và E với AD<AE. Đường thẳng vuông góc vơi AB tại A cắt đường thẳng CE tại F. Gọi M là giao điểm thứ hai của đường thẳng FB với (O). Tứ giác AMDF là hình gì ? Vì sao ?

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