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monthepotato
2 năm trước
Cho tam giaca ABC cs hai đg cao BD và CE a) CM :tam giác ABD đồng dạng tam giác ACE b) CM :tam giác ADE đồng dạng tam giác ABC c) Gọi H là giao điểm của BD và CE ,K là giao điểm của AH và BC CMR : AH vuông góc BC và CH.CE=BC.CK d) CM :BH.BD+CH.CE=BC^2
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