Bài 6.  Cho rABC (AB < AC), AH vuông góc BC tại H. Trên tia đối của tia HA lấy điểm D sao cho HD = HA, gọi M là trung điểm của BC.Trên tia đối của tia MA lấy điểm E sao cho ME = MA.              

a) Chứng minh : AB = CE và BD = CE.              b) Chứng minh : MD = ME.

c) Gọi F là trung điểm của DE. Chứng minh MF vuông góc với DE.

d) Chứng minh : DE // BC

Giải nhanh mk tick :)))

Help pls :<<

chong đây ở đâu là số 8:

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