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namnh.h.1720
2 năm trước
Cho ∆ABC vuông tại A, AB=5cm, AC=12cm, trên cạnh BC lấy điểm D sao cho BD=BA, kẻ đường thẳng qua D vuông góc với BC cắt AC ở E, tia BA ở K. a) Tính BC b) C/m: ∆ABE=∆DBE, BE là phân giác góc ABC c) C/m: AC=DK d) Đường thẳng qua A vuông góc BC tại H cắt BE ở M C/m: ∆AME cân
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