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huythuong10
2 năm trước
Cho tam giác ABC vuông ở A, phân giác BD. Kẻ DE vuông góc BC (E thuộc BC). Trên tia đối của tia AB lấy điểm F sao cho AF = CE. Chứng minh rằng: 1. Cho BC= 15cm, AB= 9cm. Tính độ dài cạnh AC. 2. BD là đường trung trực của AE 3. AD < DC. 4. Gọi M là trung điểm FC. Chứng minh: B, D, M thẳng hàng
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