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quan1221
2 năm trước
Giúp minh với mình đang cần gấp Cho tam giác ABC cân tại A (A< $90^{o}$ ) . H là trung điểm của BC. Kẻ HM ⊥ AB, HN ⊥ AC a) Chứng minh ΔBMH = ΔCNH b) Chứng minh AM = AN. Từ đó suy ra Δ AMN cân c) Trên tia đối của tia HN lấy điểm P sao cho HN = HP. Chứng minh BP ⊥ PN
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