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thuhuongb695
2 năm trước
cho tam giác ABC cân tại a trên tia đối của tia Bc lấy điểm d, trên tia đối của tia CB lấy điểm e sao cho BD=CE kẻ BP vuông góc với DA(B thuộc AD), kẻ cq vuông góc với AE (Q thuộc AE) . Gọi o là giao điểm của bp và qc a chứng minh tam giác ABD= tam giác ACE
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