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linhlinh2909
2 năm trước
16) Gọi H là trực tâm của tam giác ABC nhọn. AH, BH, CH lần lượt cắt các cạnh BC, CA, AB tại M, N, P a) Chứng minh AN.AC = AP.AB, HM.HA = HN.HB = HP.HC, MB.MC = MH.MA. b) Chứng minh các tam giác ANP, ABC đồng dạng. c) Gọi I, J là trung điểm của AH, BC. Chứng minh IJ⊥ PN
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