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сhо tam OBE vuông tại O , đường cao OH, vẽ đường tròn (0; OH), tiếp tuyến BD, CE đường tròn (0)

OC cắt HE tại A

A, Gọi M là trung điểm của CE , N là trung điểm của CH . P là điểm bất kì trên MN , PT là trung tuyến đường tròn tâm O , MN cắt OC tại K . Chứng minh PT = PC

Sagot :

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