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ahihikocomatkhaudau
2 năm trước
cho tứ giác ABCD nội tiếp (O) có hai đường chéo AC,BD cắt nhau tại P.Q và R là 2 điểm bất kỳ trên cung CD không chứa AB.RA,RC lần lượt cắt đường tròn ngoại tiếp tam giác PQR tại L,K khác R.PK,PL lần lượt cắt BC,AD tại M,N. a) cmr P,Q,N,D cùng thuộc 1 đường tròn b)cmr BC,AD cẳt nhau tại 1 điểm trên đường tròn ngoại tiếp tam giác QMN.
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