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kocoten
2 năm trước
cho tam giác ABC nhọn ( AB < AC). Hai đg cao AD và BE cắt nhau tại H. a) c/m tam giác ADC đồng dạng tam giác BEC từ đó suy ra AD.BC = AC.BE b) c/m góc CED = góc DBA c) kẻ đg cao CF của tam giác ABC. c/m tia Eb là tia phân giác của góc DEF
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