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Tuyettuyet
2 năm trước
Cho tam giác `ABC` nhọn `(AB<AC)`.Các đường cao `AD,BE,CF` của `ΔABC` cắt nhau tại `H`.Gọi `N` là giao điểm của `EF` với `BC`.cmr `1/(NB)+1/(NC)=2/(ND)`
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Dịch : Harvard University is situated along the banks of the Charles River in Cambridge , Massachusetts . The university is now a sprawling complex of more than four hundred buildings, housing, classrooms, laboratories and libraries. The Harvard faculty has produced 27 Nobel laureates and more than 20 winners of the prestigious Pulitzer Prize. Today the university has more than 16,000 students and over 2,300 full-time faculty members. Harvard is consistently ranked as one of the best schools in America and the world. And it is considered a leading international research institution. The university owes its reputation as a center for academic excellence to its professional and graduate schools, as well as to its undergraduate programme. The Medical, Law, Business and Divinity schools are leaders in their fields, attracting for students around the world. Beginning in the 1930s, Harvard made a conscious effort to recruit students from all over the United States , not just the eastern part of the nation. More recently, the university has pursued policies to increase the number of the women and minority students on campus. A long tradition of modification and change continues, but the commitment to excellence remains at the heart of Harvard education.

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