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loga4120
2 năm trước
Cho tam giác ABC cân tại A, các đường cao BD,CE cắt nhau tại H a, Chứng minh BD=CE b,Tính CE biết AD=7cm, CD=2cm c, AH cắt BC tại M. Tính AM d,Kẻ DK vuông góc, K thuộc BC. Tính KB,KC
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