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lethanhson212003
2 năm trước
Trong mặt phẳng Oxy, cho ba điểm A(-2;3), B(3;4) và C(1;-2). a) Viết phương trình tham số của đường thẳng AC. b) Viết phương trình đường trung tuyến AM của tam giác ABC c) Viết phương trình tổng quát của đường cao BH của tam giác ABC (H thuộc đường thẳng AC). Xác định tọa độ điểm H. d) Xác định tọa độ điểm B' là điểm đối xứng với điểm B qua đường thẳng AC. e) Xác định góc giữa 2 đường thẳng AC và AM Làm giúp em bài 1 với ạ
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Laptop computers are popular all over the world. People use them on trains and airplanes, in airports and hotels. These laptops connect people to their workplace. In the United States today, laptops also connect students to their classroom. Westlake College in Virginia will start a laptop computer program that allows students to do schoolwork anywhere they want. Within five years, each of the 1500 students at the college will receive a laptop. The laptops are part of a $10 million computer program at Westlake, a 100-year-old college. The students with laptops will also have access to the Internet. In addition, they will be able to use email to “speak” with their teachers, their classmates, and their families. However, the most important part of the laptop program is that students will be able to use computers without going to computer labs. They can work with it at home, in a fast food restaurant or under the trees- anywhere at all! At Westlake College, more than 60 percent of the staff use computers. The laptops will allow all teachers to use computers in their lessons. As one Westlake teacher said, “Here we are in the middle of Virginia and we’re giving students a window on the world. They can see everything and do everything.” 1. The main purpose of the laptop program is to give each student a laptop to _____. A. use for their schoolwork B. access the Internet C. work at home D. connect them to libraries 2. Why is the word “speak” in the second paragraph in quotation marks? A. They don’t really talk. B. They use the computer language. C. Laptops have speakers. D. None of the above reasons is correct. 3. Which of the following is true about Westlake College? A. All teachers use computers. B. 1500 students have laptops. C. It is an old college in America. D. Students there can do everything. 4. A window on the world in the last paragraph means that students can _____. A. attend lectures on information technology B. travel around the world C. get information from around the world D. have free laptops

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