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baoanh
2 năm trước
Cho tam giác ABC và d là đường thẳng tùy ý đi qua B. Qua E là điểm bất kỳ trên AC, vẽ các đường thẳng song song với AB, BC và lần lượt cắt d tại M, N. Gọi D là giao điểm của ME và BC. Đường thẳng NE cắt AB và MC lần lượt tại F và K. Chứng minh: a) ∆BFN ∾ ∆MDB; ∆AEF ∾ ∆ECD b) ∆AFN ∾ ∆MDC c) AN // MK
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