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thuylinh2427
2 năm trước
Cho tam giác ABC nhọn, AH là đường cao. Vẽ HM  AB; HN  AC M  AB; N  AC  a) Chứng minh:AMH ∽AHB. Từ đó suy ra AH2  AM.AB b) Chứng minh: AM.AB = AN.AC c) Chứng minh: ANM ∽ABC d) Gọi O là giao điểm của AH và MN. Chứng minh: OA.OH = OM.ON
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