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2 năm trước
tìm m để đths y=[mx^2+(m^2+1)x+4m^3+m]/(x+m) tương ứng có 1 điểm cực trị thuộc góc phần tư thứ II và 1 điểm cực trị thuộc góc phần tư thứ IV của mặt phẳng toạ độ
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Hoàn thành bài viết sau bằng cách chọn một từ/cụm từ thích hợp nhất để điền vào chỗ trống: Electronic learning is a technology of education that implies self-motivation, communication, efficiency, and technology. E-learning is effective as it (1) ____ distances because the e-learning content is designed (2) ____ media that can be (3) ____ from properly equipped computers, and other means of internet accessible technology. E-learning has its own advantages. However, the most important advantages (4) ____ in the reduction of time, efforts and cost. Furthermore, we can talk about the following (5) ____ of E-learning with the increasing of communication between the student and themselves and between the student and the school a fast and easy way is needed to bring everybody together. Throughout different directions such as discussing forums, e-mail, and chat rooms, (6) ____ think that these things increase and motivate students to participate and react with the subjects in question. Another advantage of e-learning as that it makes all students feel equal. Since the communication tools give (7) ____ students the opportunity to express his own opinion clearly and directly at any time without being embarrassed, in contrary to the traditional teaching halls (8) ____ don't have such a feature due to the bad distribution of the tables or because of shyness or other reasons. E-learning provides teachers with great facilities that are accessible out of working hours, that is because the learner can send the inquiries to the teacher through the e-mail at (9) ____ time, yet this feature is more useful and suitable for the teacher instead of being instead of being restricted at his desk. By e-learning the attendance is not necessary as the new technology provides the communication (10) ____ without the need to be available in a specific place or time. 1. A. instrument B. equipment C. machine D. eliminates 2. A. with B. enables C. make D. makes 3. A. add B. put C. cause D. accessed 4. A. see B. saw C. lay D. has seen 5. A. ask B. advantages C. learn D. request 6. A. only B. either C. researchers D. not only 7. A. each B. possibility of C. method of D. right about 8. A. about B. which C. of D. for 9. A. settings B. sights C. surroundings D. any 10. A. up to our B. time to us C. methods D. in time

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