Cho Hình bình hành ABCD, kẻ BE vuông CD, BK vuông AD, ($K \in AD$, E thuộc CD), EK=a; BD=b (b>a). Tính khoảng cách từ B đến trực tâm của $\triangle BEK$.

bị xóa vì bị trùng bởi Đức Vỹ 25-10-13 10:40 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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