Tứ giác $ABCD $ có trung điểm 2 đường chéo $M,N$ không trùng nhau.Đường thẳng MN cắt AD tại P và cắt BC ở Q.CM $PA.BQ=PD.QC$

Câu hỏi này được treo giải thưởng trị giá +1000 vỏ sò bởi mancheter5200@gmail.com, đã hết hạn vào lúc 06-07-14 10:48 AM

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