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honghanh2k1
2 năm trước
Cho tam giác ABC cân tại A có góc A nhỏ hơn 90°. Kẻ BD vuông góc AC tại D. Trên cạnh AB lấy điểm E sao cho AE = AD. Chứng minh: a) DE // BC b) CE vuông góc AB Giải giúp nha cảm ơn nhiều
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