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ngolananh02000
2 năm trước
Cho tam giác ABC có AB < AC. Lấy E thuộc AC sao cho AE=AB. Trên tia đối của tia BA lấy điểm D sao cho BD=EC. a) Chứng minh rằng tam giác ADC cân tại A. b) Kẻ AH vuông góc với BE tại H, AH cắt DC tại K. Chứng minh AK là đường trung trực của DC.
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