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sinhthanhnb83
2 năm trước
Cho tam giác ABC và điểm M là điểm trong của tam giác ABC . Gọi A'B',C' lần lượt là trung điểm của BC,CA,AB. Gọi N,P,Q lần lượt là các điểm đối xứng của M qua À',B'C' a, Chứng mình vectơ AQ= vector CN,vector AM=PC b, chứng minh 3 đường thẳng AN,BP,CQ đồng quy
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