Cho tam giác ABC vuông tại A (AB>AC), M là trung điểm BC. Gọi H là hình chiếu của M trên AC a) Chứng minh H là trung điểm AC. b) Từ M kẻ đường thẳng vuông góc với BC cắt AC kéo dài tại F. Chứng minh BC.HM=EM.AC c) Gọi N là trung điểm MH. Chứng minh góc NEM = góc HBC. d) Chứng minh BH vuông góc với EN. P/s. Làm ơn giải chi tiết và vẽ hình giúp ạ. Mai em phải nộp rồi. :((

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