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ngokimsang1996
2 năm trước
Cho tam giác ABC có AB<AC, đường cao AD, BE, CF giao nhau tại H. Điểm K đối xứng với H qua M trung điểm BC . FE giao BC tại N. Chứng minh rằng : $\frac{1}{NB}$ + $\frac{1}{NC}$ = $\frac{2}{ND}$ * MỌI NGƯỜI GIÚP E VỚI, HỨA SẼ VOTE 5* VÀ CTLHN NẾU ĐÚNG Ạ*
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