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manhronaldo131101
2 năm trước
Cho tam giác ABC nhọn, đường cao AH. Kẻ HI vuông góc với AD và HK vuông góc với AC a) chứng minh: KH^2=AK.KC b)Chứng minh tam giác ABC dồng dạng với tam giác AKI c) đường phân giác góc AHB cắt AB tại E. Biết EB/AB=2/5. tính BI/AI mk cần gấp ạ
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