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nxuanphuc089
2 năm trước
Cho ΔABC vuông tại A. Tia phân giác của góc B cắt AC ở D; E là một điểm trên cạnh BC sao cho BE = BA. a) Chứng minh rằng: ΔABD = ΔEBD. b) Chứng minh rằng: DE vuông góc BC. c) Gọi F là giao điểm của DE và AB. Chứng minh rằng DC = DF.
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